Maths ideas – Page 5 – Gareth Metcalfe Primary Maths

February 19, 2016February 15, 2016 garethmetcalfe Maths ideas

Questions and Images for Deepening, Part 3

This school year I’ve been blogging example activities, questions and images that I’ve used to extend mathematical reasoning with my class. Here goes for Spring 1:

Sorting shapes using a branching database. Children create questions to sort, position the shapes then cover their questions. Other groups have to work out what their sorting questions are. This structure could easily be adapted and used with numbers.

Similarly, classifying shapes in a Venn diagram, with children deducing the headings:

‘All sides the same length’ and ‘At least 2 acute angles’.

Here’s a reasoning question based on finding missing angles in an isosceles triangle, with two possible solutions represented visually:

The following exhibits were used to allow children to unpick and explain the most common misconceptions when measuring angles:

And finally I’ve posted various images of dot patterns that I’ve found for subitizing games. Children are asked to recognise without counting how many dots are in the given pattern (selected age-appropriately). The different ways in which the children visualised and broke down the number of dots in each image can be explored.

Since January I’ve also shut myself away and, as I’ve promised myself for ages, finally spent time writing the Y4/Y5 follow-up to First Class Maths. I am 3 tasks (and a stack of trials/edits) away from completing it, which I’m very excited about – more updates to follow on this one soon. Have a great Spring 2!

January 17, 2016 garethmetcalfe Education General, Maths ideas

Frozen Saltwater and Negative Numbers

Much emphasis is now being placed on representing mathematics practically and visually (and quite rightly). For obvious reasons, it’s harder to do this with negative numbers. Here’s a classic activity that I came across on my first Primary Science Teaching Trust conference for showing children negative numbers in context. It can also be used to answer the question ‘Why do we put salt on the roads when it’s icy?’

Have a container filled with icy water and add quite a lot of salt. By putting the temperature probe into and out of the icy solution, the children will be able to see how the temperature changes (and how numbers change from positive to negative and vice versa) as the temperature goes above and below 0 degrees. Most dataloggers come with software that will allow you to graph this pattern as well as displaying the temperature.

By adding the salt, the freezing point of the solution becomes lower. At the maximum level of saturation for salt (according to Google), the freezing point for a saline solution is -21 degrees Celsius. This demonstrates that the salt doesn’t make the water hotter, as I’ve heard children suggest, but that it changes the freezing point. It’s also worth noting that if the temperature were to fall below -21 degrees it would be pointless to grit the roads.

This context could be used simply as a demo of negative numbers, or it could lend itself to a more extended scientific enquiry. Let’s just hope that thawing ice on the roads isn’t a subject that is too topical for too long!

December 29, 2015February 5, 2017 garethmetcalfe Education General, Maths ideas

Questions for Deepening Part 2

I’ve been on a mission this year to post lots of examples of questions and tasks that I have used on a daily basis to deepen the thinking of the children in my year 6 class. I’m also posting activities that I’ve seen used in classes throughout the school. Below are all my posts from Autumn half-term 2. I hope that there’s something here that you may find useful!

First of all, I found this image from a Chinese textbook showing how > and = signs are introduced:

A task from Y2 that encourages children to use the = sign in different places:
A question which is very accessible but can be extended by children working systematically to find all possible solutions:

And another allowing children to explore parts and wholes:

An ‘immersion’ activity used to encourage children to see division as grouping (e.g. representing 26/3 as ‘how many 3s in 26?’):

And some questions that I’ve used with my own class.

Area and perimeter:

Percentages:
Averages:
Below is the visual representation used to unpick that final question:

My favourite resources for providing deep, meaningful mathematical challenges are those that I have published with Alan Peat ltd. These are more rich, extended and often contextualised tasks.

First Class Maths provides deep, extremely challenging and quirky tasks.

The Maths Apprenticeship gives extended challenges for deepening mathematical and personal competence skills.

Logic Squares is all about getting children playing with numbers.

October 25, 2015October 25, 2015 garethmetcalfe First Class Maths, Maths ideas, The Mathematics Apprenticeship

Questions for deepening

We’ve all read about the vision for ‘mastery’ learning in maths; I’d figured that what teachers want is to see actual examples that they might be able to use with their class. So once we got back from our residential, I decided to post pictures of questions that I use with my year 6 class (and the odd example from around the school) to deepen their learning. The reaction on social media has been very positive, so I’ve dumped them all on this blog.

At the start of the year I used one of my favourite questions:

Which two numbers have a sum of 9 and a difference of 4?

This one’s more complex than it may initially seem as the solution involves halves. An easier version is shown below:

Sara and John spent a total of 40p at the school council shop. Sara spent 10p more than John. How much did John spend?

Then came deepening within rounding:

A question exploring the difference between negatives & decimals:
How many time do you have to halve 128 until you get a negative number?

And drawing together rounding and negative numbers:

Note that for question 3, one of the numbers is negative.

Two fractions questions with multiple solutions:

A year 4 question looking at deepening vertical addition:

And finally reasoning in multiplication:

I’m hoping to keep these posts coming (Twitter @gareth_metcalfe or FB Gareth Metcalfe Primary Maths) and, in the fullness of time, to make freely available a set of deep reasoning questions for all year-groups. If you’ve found it useful, or you know someone who might be interested, please share this blog post!

My maths resources, published by Alan Peat ltd, have also been designed to deepen children’s experience of maths.

First Class Maths provides deep, extremely challenging and quirky tasks: https://garethmetcalfe.wordpress.com/2015/02/01/first-class-maths-curious-and-challenging/

The Maths Apprenticeship gives extended challenges for deepening mathematical and personal competence skills: https://garethmetcalfe.wordpress.com/2014/05/22/tma-the-how-to-guide/

And Logic Squares is all about getting children playing with numbers: https://garethmetcalfe.wordpress.com/2015/10/03/the-learning-in-logic-squares/

October 3, 2015June 7, 2016 garethmetcalfe Maths ideas

The Learning in Logic Squares

There are lots of maths apps on the market: most are visually appealing and allow children to rehearse key mental maths skills. What more does Logic Squares have to offer? This blog gives six reasons why Logic Squares takes children’s learning to a deeper level.

Accessible challenge

At the start of each level, the player can select ‘kick-start’. This will put one of the numbers into position, giving a significant clue to help the player to unlock the level. In doing so, the levels are made more accessible for children of different abilities. There are a range of solutions for each level.

Useful feedback
When the player clicks ‘check’ any lines that are incorrect are highlighted in red. Then the player can re-position the numbers having seen their mistake(s), allowing them to address any misunderstandings in a non-threatening way.

High threshold
By the end the levels will stretch even the most able primary child. Take level 18 (using 1-20). Can the children reason as to why the number positioned has to be a 2? Children have to identify the lines with fewer possible solutions and learn to complete these parts first.

Supports understanding of = and > signs

Children’s understanding of = as ‘same as’ rather than ‘makes’ will be secured. The example on the left shows how the common structure ___ – ___ = ___ is reversed to ___ = ___ – ___. The grids from level 16 onwards are 7×7, allowing for two numbers either side of the equals sign. < and > sings are used throughout.

Subtraction as difference

Let’s assume the children start level 11 by filling in the bottom line. They may complete a vertical line using the most straightforward calculation that comes to mind (4-3=1). Soon they’ll realise that they need to be more selective in their use of the smaller numbers; larger numbers can be used in subtractions, considering differences.

Understand how to manipulate numbers in calculations
On level 12 the player has got to this point and has realised they are unable to complete the last line. Which is the first line to try to alter?The vertical line on the right hand side? Unlikely to work. The middle horizontal line? The 6 and 5 aren’t interchangeable; also, neither number could be used in the position of the 1. But switch around the 4 and the 2 and we have a solution!

So that’s how Logic Squares gets children playing with numbers and exploring key mathematical concepts in a fun, non-threatening way.

To see level 10 in detail, read the blog:
https://garethmetcalfe.wordpress.com/2015/08/31/logic-squares-the-strategy-maths-app/

Logic Squares for the iPad is on sale in English:

https://appsto.re/gb/nF2S9.i

And in Welsh:

https://appsto.re/gb/apng-.i

August 31, 2015August 31, 2015 garethmetcalfe Maths ideas

Logic Squares: the strategy maths app

Logic squares is a maths app soon to be released by Alan Peat Ltd. Players will learn to manipulate numbers within calculations, becoming increasingly strategic in their thinking as the levels progress in difficulty.

The rules are simple: fill the gaps using the numbers provided to make each line correct. To make the levels more accessible, a ‘kick-start’ button can be pressed at the start of every round which positions a number automatically. Mistakes are highlighted in red when the player clicks ‘check’, directing the player to any errors so amendments can be made.

Levels progress from more straightforward:

To the very challenging:

Let’s look at level 10 in detail and the kind of thought processes that the children will need to go through to answer it successfully.

Firstly (and crucially) children need to think carefully about their starting point. If they start with the addition and subtraction lines and ‘fill in’ the multiplication line last, they are unlikely to find a solution as there are far fewer ways to complete the multiplication. And which multiplication to choose: 3×2? 5×2? When you look at the right hand column (__+__), probably the one with the higher product. Let’s assume that the player’s started with 5×2=10:

So a logical next step would be to find two numbers that add to make 10. Which combination of numbers is best? And which way around should the numbers be positioned? Consider this:

The 4 can be made with the 1 and the 3, but with the larger number (the 6) being on the top line and all the smaller numbers used up, it’s not possible to make the top line correct. An adjustment’s needed. The player may realise that it’s easier if the larger number’s used as the answer to the addition rather than the subtraction. Say 7 and 3 are tried next:

Now the player’s in a position to find a solution (there are multiple solutions for all the levels):

I’m going to produce videos demonstrating the process of completing 3 of the levels that teachers can show to children, to make the learning from the tasks explicit. However, the thing that I love about Logic Squares is that it’s in the (highly addictive) process of trial and error, seeing links and spotting mistakes, being frustrated then finding a way to overcome, that the majority of the learning takes place. By the time the children get to level 25, they’ll have honed a wide range of crucial mathematical skills and ideas. Enjoy!

August 17, 2015August 17, 2015 garethmetcalfe Maths ideas

Reasoning tasks to start the school year

I came across this puzzle in a book full of questions that were on 11-plus tests in the 1940s and 1950s under the ‘General Intelligence’ section (couldn’t use that term nowadays!). It’s a great one for getting the children to reason in a non-standard context:

The leader of a Guide patrol is named Mary Jenkins; so her surname is Jenkins, her Christian name is Mary, and her initials are M.J. There are 6 other girls in the patrol; each has 2 initials. Surnames: Brown, Smith, Evans, Clark, Jones. Christian names: Molly, Celia, Gwen, Ruth, Sally. Two girls have surnames and Christian names beginning with the same letter; two others are named Ruth. One of the twins has the same initials as the leader and the other has the same Christian name as Evans. Write down each girl’s full name.

Here’s a typical route for answering the question:
*There are 6 girls but only 5 surnames/Christian names – there are two Ruths and there are twins.
*To have the same initials as the leader, one twin is Molly Jones.
*The other twin must be Ruth Jones (same Christian name as Evans, only repeated name is Ruth). This also gives Ruth Evans.
*Two Surnames/Christian names with same letter, Sally Smith and Celia Clark
*One Christian name and one surname left, Gwen Brown

I then give children this question to show how they can use the same kind of logical reasoning to answer a more ‘standard’ maths question:

Use the following digits once to make the calculations correct: 7, 6, 3, 9, 8

_______ x 3 = 18 + _______

2 < 9 – _______

_______ / 2 < 4

_______ + 8 > 2 x 2 x 2 x 2

Here’s a typical route to solve the problem:
*2 x 2 x 2 x 2 = 16 so 9 is the only number that can go in the last gap.
*There are two combinations that make the top line balance (7&3, 8&6) but the 8 can’t fit in any of the other gaps, so it must be on the top line with the 6.
*You are left with 7 and 3. Either number can go on the 3rd line but the 7 doesn’t fit the second line, therefore 3 is on line 2.
*By process of elimination, 7 must be on line 3. It is Gwen Brown – the leftover number!

These principles could then be applied and extended in a range of other contexts: for example, Ken Ken puzzles rely on very similar logical thought processes. I will be using these two questions at the start of the school year as I look to establish a positive mathematics culture with my new class.

March 10, 2015March 10, 2015 garethmetcalfe Maths discussion, Maths ideas

Developing reasoning in daily maths lessons

The new maths curriculum requires children to become fluent with number whilst developing the ability to reason mathematically and problem-solve. To achieve this, children will need a broad range of mathematical experiences. Here, I will share a small piece of this jigsaw: how a ‘traditional’ maths lesson – a lesson aimed at developing fluency – can be tweaked to incorporate reasoning and problem-solving skills.

The procedural skill introduced in the lesson centred around the use of brackets. However, there are two fundamental mathematical principles that are also being developed here: the use of inverse, and the understanding of the = sign meaning ‘same as’ rather than ‘makes’. This is reflected by the questioning (mid level of difficulty) as shown below. There is a gradual progression in the structure and depth of the questions, challenging the children’s understanding of the concepts in a non-routine way.

Question 5 is then used to extend the reasoning element by using the ‘how many ways?’ structure. This challenges the children to work systematically to find all possible solutions.

These principles can be used for children of all ages. For example, presenting subtraction calculations in the following order will encourage children to reason about the underlying structure of subtraction:

13 – 8

12 – 7

11 – 6

Equally, consider how the following equation helps a child to develop their conceptual understanding of multiplication and of the = sign:

4 x 5 = 4 + 4 + 4 + 8

Also, the ‘how many ways…’ question structure is enormously adaptable, allowing you to build reasoning into maths lessons on a daily basis. I hope it’s a little technique that some people may find useful!

October 13, 2014October 13, 2014 garethmetcalfe Maths ideas

My favourite properties of number question

‘Do all odd square numbers greater than 1 have 3 factors?’

I love this question. Let me explain why, and the train of thought that it can generate.

Children usually start by generating the odd square numbers, identifying that square numbers have an odd number of factors (1, the number and the square root). This helps to underline the uniqueness of square numbers. Nothing new here, really.

So children tend to identify the first two or three odd squares greater than one (9, 25 and 49) and realise that these numbers only have 3 factors. This, I tend to find, is enough evidence to convince most children that the answer to the question must be ‘yes’.

However, this is of course a false presumption, and by making it children realise a crucial mathematical principle: that finding examples to support a theory is not the same as finding a proof. There must be reasoning as well as examples to generate a proof!

So I then ask the children to consider 81. And they soon realise that it is also divisible by 3. What’s happened to the pattern? And why?

Children then investigate further examples, noting that 5 of the first 6 odd square numbers greater than 1 (9, 25, 49, 121, 169) have only 3 factors. But then 225, the square of 15, has 9 factors! There must be some logic here, and of course there is. I ask the children to consider the square roots of each number, as underlined below:

After much discussion and deliberation, and a healthy dollop of struggle, someone makes the breakthrough: the numbers with prime square roots have 3 factors; other numbers can be further divided by the factors of the square.

But does this pattern continue for all odd squares? And why was 1 excluded from the list?

It’s an amazing question for exploring the very nature of the properties of number, and particularly primes and squares. And, in my opinion, for experiencing the joy and beauty of mathematics!

September 8, 2014September 8, 2014 garethmetcalfe Maths ideas

Books as context for maths

I recently tweeted a request for people to let me know about books that they have used as a context for maths with nursery, reception and KS1 children. The response was fantastic, thanks to everyone who replied. Here is the final list:

None the Number, a counting adventure
The Hungry Caterpillar (the most mentioned book)
A Place for Zero
How Big is a Million
Ladder to the Moon
Guess How Much I Love You (I read this book to my 2 y-o daughter!)
Ten on the Sled
One is a snail, ten is a crab
Benny’s Pennys
Ten Black Dots
Jim and the Beanstalk
George’s Marvellous Medicine
Dear Zoo
Kipper’s Birthday
Percy the Park Keeper (series)
Farmer Duck
Goldilocks
Jasper’s Beanstalk
We’re going on a bear hunt
Six Dinner Did
Bad Tempered Ladybird
The Great Pet Sale
Titch
You’ll Soon Grow Into Them

Again, a huge thanks to everyone! I will try to tweet about how these books get used in my school. It shows the power of twitter as an ideas-sharing forum; it’s great to be linked up with so many passionate, knowledgeable people!