Reach Age 7 to 14 Challenge Level: Every card he revealed had the same value as the one he had just finished spelling. Can you work out some different ways to balance this equation? Ribbon Squares Age 7 to 11 Challenge Level: Who said that adding couldn’t be fun? How many ways can you find to do up all four buttons on my coat? The tasks in this collection can be used to encourage children to convince others of their reasoning, using ‘because’ statements.

Four bags contain a large number of 1s, 3s, 5s and 7s. Are you surprised by the results? Follow the Numbers Age 7 to 11 Challenge Level: Mystery Matrix Age 7 to 11 Challenge Level: Can you find different ways of doing it? Subtraction Surprise Age 7 to 14 Challenge Level: Square Subtraction Age 7 to 11 Challenge Level:

Buying a Balloon Age 7 to 11 Challenge Level: How many possible necklaces can you find?

A game for prkblem people, or play online. 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’. Explore Alex’s number plumber. Using the information given, can you replace the stars in the calculation with figures?

Find the chain which contains the smallest possible numbers.

## Addition and Subtraction KS2

In the second article, Jennie offers you practical ways to investigate aspects of your classroom culture and in the third article, she suggests three ways in which we can support children in becoming competent problem solvers. Sllving challenge is a game for two players.

Amy’s Dominoes Age 7 to 11 Challenge Level: Which pairs of cogs let the coloured tooth touch every tooth on the other cog? Mrs Morgan, the class’s teacher, pinned numbers onto the backs of three nricy. Arrange the four number cards on the grid, according to the rules, to make a diagonal, vertical or horizontal line.

## Problem-solving Skills

Prison Cells Age 7 to 11 Challenge Level: Dolving and Division KS2. To support this aim, members of the NRICH team work in a wide range of capacities, including providing professional development for teachers wishing mths embed rich mathematical tasks into everyday classroom practice.

Four Go Age 7 to 11 Challenge Level: Can you work out the missing numbers? 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. What kind of number do you get? There are 78 prisoners in a square cell block of twelve cells.

# Working Systematically at KS2 :

The tasks in this collection encourage lower primary children to conjecture and generalise. Here are some solvin problem-solving skills:. There is a clock-face where the numbers have become all mixed up.

Norrie sees two lights flash at the same time, then one of them flashes every 4th second, and the other flashes every 5th second. What Do You Need? Tim had nine cards each with a different number from 1 to 9 on it.

Tim had nine cards each with matha different number from 1 to 9 on it. To support this aim, members of the NRICH team work in a wide solvign of capacities, including providing professional development for teachers wishing to embed rich mathematical tasks into everyday classroom practice.

The value of the circle changes in each of the following problems. The numbers 1 – 9 may be used once and once only. mats

# Addition and Subtraction KS2 :

What’s All the Talking About? This task combines spatial awareness with addition and multiplication. If you know the numbers that come out, what multiplication might be going on in the box? Fifteen Cards Age 7 to 11 Challenge Level: