How many extra pebbles are added each time? Play to 37 Age 7 to 11 Challenge Level: How about if I had five buttons? How did this work? Tea Cups Age 7 to 14 Challenge Level:

Here’s a strategy game with lots to explore. Multiply Multiples 2 Age 7 to 11 Challenge Level: Four bags contain a large number of 1s, 3s, 5s and 7s. Inky Cube Age 7 to 14 Challenge Level: Age 7 to 11 Challenge Level: Can you complete this jigsaw of the multiplication square? Can you discover its value in each problem?

The clever prison warder arranged them so there were 25 along each wall of the prison block. Multiplication and Silving KS2. Tasks for KS1 children which focus on working systematically.

Investigate the different numbers of people and rats there could have been if you know how many legs there are altogether! What questions would you like to ask? Two Clocks Age 7 to 11 Challenge Level: Age 5 to 7 Reasoning and Convincing at KS1 The tasks in this collection can be used to encourage children to convince others of their reasoning, using ‘because’ statements. Sweets are given out to party-goers in a particular way.

How might you show them in a picture, with things, with numbers and symbols? Use 4 four times with simple operations so that you get the answer Cycling Squares Age 7 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.

## Working Systematically at KS2

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?

Age 7 to 11 Trial acrivities Improvement at KS2 These upper primary tasks could all be tackled using a trial and improvement approach.

Each light in this interactivity turns on according to a rule. Look at three ‘next door neighbours’ amongst the counting numbers. What do the numbers shaded in blue on this hundred square have in common?

# Time KS2 :

The lower primary tasks in this js2 could each be solved by working backwards. She gave the clown six coins to pay for it. Register for our mailing list. How many different shaped boxes can you design for 36 sweets in one layer?

Watch the Clock Age 7 to 11 Challenge Level: Use the maps to work out the number of points each of their routes scores. What was the total and how could this be done?

## Problem-solving Skills

This game is part of our creativity project, which you can read more about here. 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.

Play this game and see if you can figure out the computer’s chosen number. Finding Fifteen Age 7 to 11 Challenge Level: What are all the different possible answers? Scroll down to see groups of tasks from the site which will give learners experience of specific skills. How do you know if your set of dominoes is complete? Buying a Balloon Age 7 to 11 Challenge Level: By explicitly drawing children’s attention to nriich four stages, and by spending time on them in turn, we can help children become more confident problem solvers.

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 Is the Time? Flashing Lights Age 7 to 11 Challenge Level: