How many ways can you find to do up all four buttons on my coat? Four of these clues are needed to find the chosen number on this grid and four are true but do nothing to help in finding the number. Which of her domino pieces are missing? The tasks in this collection can be used to encourage children to convince others of their reasoning, by first convincing themselves, then a friend, then a ‘sceptic’. These clocks have only one hand, but can you work out what time they are showing from the information?

How about every third point? What could the half time scores have been in these Olympic hockey matches? This feature draws together tasks which give learners opportunities to reason for different purposes. All the Digits Age 7 to 11 Challenge Level: This article, written for primary teachers, discusses what we mean by ‘problem-solving skills’ and draws attention to NRICH tasks which can help develop specific skills. She gave the clown six coins to pay for it.

Pebbles Age 7 to 11 Challenge Level: Domino Square Age 7 to 11 Challenge Level: How could you record what you’ve done?

## Problem-solving Skills

Money Bags Age 5 to 11 Challenge Level: Register for our mailing list. Reach Age 7 to 14 Challenge Level: Y33 a Tie Age 7 to 11 Challenge Level: Can you predict when you’ll be clapping and when you’ll be clicking if you start this rhythm?

These upper primary tasks could all be tackled using a trial and improvement approach. Amy has a box containing domino pieces but she does not think it is a complete set. Wonky Watches Age 7 to 11 Challenge Level: This multiplication uses each of the digits 0 – 9 once and once only. How many different ways can you do it?

Register for our mailing list. Look at the changes in results on some of the athletics track events at the Olympic Games in and The Zios have 3 legs and the Zepts have 7 legs. A game for two people, or play online.

# Problem Solving :

Real Statistics Age 7 to 11 Challenge Level: The tasks in this collection encourage upper primary children to conjecture and generalise. Choose two of the numbers to multiply or divide, then mark your answer on the number line. Can you put the numbers in the V shape so that both ‘arms’ have the same total?

On a digital 24 hour clock, at certain times, all the digits are consecutive. Tim solbing nine cards each with a different number from 1 to 9 on it. She arranged the cards into 6 unequal piles where each pile added to the same total.

Use 4 four times with simple operations so that you get the answer Four of these clues are needed to find the chosen number on this grid and four are true but do nothing to help in finding the number.

She gave the clown six coins to pay for it.

## Handling Data KS2

Imagine a pyramid which is built in square layers of small cubes. Age 7 to 11 Challenge Level: Division Rules Age 7 to 11 Challenge Level: Investigate the sum of the numbers on the top and bottom faces of a line of three dice. Working Systematically at KS2.

Class 5’s Names Age 7 to 11 Challenge Level: Age 7 to 11 Reasoning and Convincing at KS2 The tasks in this collection can be used to encourage children to convince others of their reasoning, by first convincing themselves, then a friend, then a ‘sceptic’. Solvinh cube has ink on each face which leaves marks on paper as it is rolled.

Investigate the total number of sweets received by people sitting in different positions. Going for Gold Age 7 to 11 Challenge Level: