Addition and Subtraction KS1. How many sweets could she have had? There are also nine houses, three of each colour. Age 7 to 11 Working Backwards at KS2 The upper primary tasks in this collection could each be solved by working backwards. KS1 Age 5 to 7 Challenge Level: First they were counting in twos.

Two Halves Age 3 to 5 Halving. This challenge involves eight three-cube models made from interlocking cubes. Age 5 to 7 Visualising at KS1 These lower primary tasks all specifically draw on the use of visualising. Beads and Bags Age 5 to 11 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. Incey Wincey Age 3 to 5 Counting.

There are three baskets, a brown one, a red one and a pink one, holding a total of 10 eggs. An investigation looking at doing and undoing mathematical operations focusing on doubling, halving, adding and subtracting.

# Working Backwards at KS1 :

Starting from wolving end sounds rather strange, but in fact can be a very useful problem-solving skill. Does it matter if you go first or second? If you hang two weights on probkem side of this balance, in how many different ways can you hang three weights on the other side for it to be balanced? What would the solution be in each case? Domino Sorting Age 5 to 7 Challenge Level: Scroll down to see groups of tasks from the site which will give learners experience of specific skills.

It is read more topic that children need to have time to explore solving think about, using a variety of nrich to help make sense of it. 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.

# Problem-solving Skills :

How many lollies could there have been in the bag? Are there any left over each time? What’s All the Talking About?

How many pairs is that? If you know the numbers that come out, what addition might be going on in the box?

## Working Backwards at KS1

This activity is best nricu with a whole class or in a large group. Two Halves Age 3 to 5 Halving. What patterns can you make with a set of dominoes? You can put more than one weight on a hook. As you come down the ladders of the Tall Tower you collect useful spells.

## Counting and Ordering KS1

Complete the number patterns. Nrich up the maths with coins. Secret Number Age 5 to 7 Challenge Level: A hundred square has been printed on both sides of a piece of paper. Pat counts her sweets in different groups and both times she has some left over. What can’t you make?

It’s Sahila’s birthday and she is having a party. If you know the numbers that come out, what addition might be going on in the box?

Ben and his mum are planting garlic. Stop the Clock Age 5 to 7 Challenge Level: Pairs of Numbers Age 5 to 7 Challenge Level: Age 7 to 11 Working Backwards at KS2 The upper primary tasks in this collection could each be solved by working nich. Can you complete this jigsaw of the square? How could you put these three beads into bags?

The Add and Take-away Path Stage: