### NRICH PROBLEM SOLVING KS1 ADDITION

Half Time Age 5 to 11 Challenge Level: What questions would you like to ask? Ram divided 15 pennies among four small bags. Heads and Feet Age 5 to 7 Challenge Level: Buzzy Bee Age 5 to 7 Challenge Level: What numbers of total spots can you make? This group activity will encourage you to share calculation strategies and to think about which strategy might be the most efficient.

Shut the Box Age 5 to 7 Challenge Level: Use the cards to gather all the information you need. In this calculation, the box represents a missing digit. Cuisenaire Counting Age 5 to 7 Challenge Level: Crossed Ends Age 11 to 14 Challenge Level:

These activities lend themselves to being tackled in this way. Four bags contain a large number of 1s, 3s, 5s and 7s.

This investigates one particular property of number by looking closely at an example of adding two odd numbers together.

Button-up Age 5 to 7 Challenge Level: In this square, look at the green square which contains the numbers 2, 3, 12 and Arrange three 1s, three 2s and three 3s in this square so that every row, column and diagonal adds to the same total. Can you choose sets of numbers to collect so that you spin six numbers belonging to your sets in as few spins as possible?

# Working Systematically at KS1 :

Ahmed is making rods using different numbers of cubes. My coat has three buttons. Can you put the numbers in the V shape so that both ‘arms’ have the same total? Maths Story Time Age 3 to 5 Telling a story to provoke mathematical discussion, language and reasoning.

Can you find 2 butterflies to go on each flower so that the numbers on each pair of butterflies adds to the same number as the kd1 on the flower? Register for our mailing list. What happens with different starting numbers? What Js1 It Be?

## The Puzzling Sweet Shop

What can’t you make? Age 5 to 7 Challenge Level: Age 5 to 11 Challenge Level: How many different triangles can you draw on the dotty grid which each have one dot in the middle?

Adding and Taking Away. How could he have put them into three piles so that the total in each pile was 15? Register for our mailing list.

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# Problem Solving :

This group activity will encourage you to share calculation strategies and to think about which strategy might be the probem efficient. What different shapes do they make if each part lies in the small squares of a 4 by 4 square? Working Backwards at KS1.

Are there any left over each time? Which rod is twice the length of his first rod?

## Problem Solving

Number Pyramids Age 11 to 14 Challenge Level: Can you use the information to find out which cards I have used? Follow the clues to find the mystery number.

Sweets are given out to party-goers in a particular way. She stopped for a rest after writing seventeen digits.

Use your logical-thinking skills to deduce how much Dan’s crisps and ice-cream cost altogether. Which way should you go to collect the most spells?