### NRICH PROBLEM SOLVING KS1 ADDITION

Age 7 to 11 Challenge Level: Are there any left over each time? The fourth article builds on the third by discussing what we mean by problem-solving skills and how NRICH can help children develop these skills. Always, Sometimes or Never? Noah saw 12 legs walk by into the Ark.

Which will you do so that you get to the end of the number line first? How many ways can you find to do up all the buttons? These activities lend themselves to being tackled in this way. The upper primary tasks in this collection could each be solved by working backwards. Making Sticks Age 5 to 7 Challenge Level: Place the numbers 1 to 6 in the circles so that each number is the difference between the two numbers just below it.

Shut the Box Age 5 to 7 Challenge Level: Many opportunities to work in different ways. An old game but lots of arithmetic! All Change Age 5 to 7 Challenge Level: On a farm there were some hens and sheep. Two Dice Age 5 to 7 Challenge Level: Tug of War Age 5 to 7 Challenge Level: The Voting Station Age 3 to 5 Counting and comparing. Can you find out their scores? If addirion are 3 squares in the ring, can you place three different numbers in them so that their differences are odd?

Clapping Times Age 5 to 7 Challenge Level: To support this aim, members of the NRICH team work in a wide range of capacities, including providing professional development for teachers wishing to embed rich mathematical tasks into everyday classroom practice.

## Working Backwards at KS1

Can you find some paths of your own? Can you find the chosen number from the grid using the clues? To support this aim, members of the NRICH problfm work in a wide range of capacities, including providing professional development for teachers wishing to embed rich mathematical tasks into everyday classroom practice.

If you hang two weights on one side of this balance, additikn how many different ways can you hang three weights on the other side for it to be balanced?

Make 37 Age 7 to 14 Challenge Level: The sum of the numbers inside it is written on each envelope. Can they make any other lines?

The picture shows a lighthouse and many underwater creatures. The idea of this game is to add or subtract probleem two numbers on the dice and cover the result on the grid, trying to get a line of three.

Use these head, body and leg pieces to make Robot Monsters which are different heights. Working Backwards at KS1.

# Calculations and Numerical Methods :: Addition & subtraction :

How could you answer these questions using a picture, with things, with numbers or symbols? What nruch Annie’s secret number? Even and Odd Age 5 to 7 Challenge Level: What would the solution be in each case?

In this article, Jennie suggests that we can support this process in three principal ways.

## Addition and Subtraction KS2

Register for our mailing list. Half Time Age 5 to 11 Challenge Level: What strategies did you use? Find the next two dominoes in these sequences.

Find the Difference Age 5 to 7 Challenge Level: This group activity will encourage you to share calculation strategies and to think about which strategy might be the most efficient. What two-digit numbers can you make with these two dice? These sixteen children nrlch standing in four lines of four, one behind the other.