# NRICH PROBLEM SOLVING KS1 ADDITION

Ip Dip Age 5 to 11 Challenge Level: Can you explain why? Arrange the numbers 1 to 6 in each set of circles below. Try with different numbers of squares around the ring. Are these statements relating to odd and even numbers always true, sometimes true or never true?

My coat has three buttons. Annie and Ben are playing a game with a calculator. We start with one yellow cube and build around it to make a 3x3x3 cube with red cubes. Getting the Balance Age 5 to 7 Challenge Level: Ladybirds in the Garden Age 5 to 7 Challenge Level: What questions would you like to ask? Find the Difference Age 5 to 7 Challenge Level:

Scroll down to see our complete collection of KS1 problems that require children to work systematically, or explore the two sub-collections focusing on important aspects of systematic working.

## The Puzzling Sweet Shop

How could you sort the cards? Use the interactivity to help you find out how many cloves of garlic they might have had.

Register for our mailing list. All Change Age 5 to 7 Challenge Level: Totality Age 5 to 11 Challenge Level: Register for our wddition list. Can you work out the missing numbers?

Tasks for KS2 children which focus on working systematically. Lolla bought a balloon at the circus. What happens when you add three numbers together? Getting the Balance Age 5 to 7 Challenge Level: Choose a symbol to put into the number sentence. On Friday the magic plant was only 2 centimetres tall. Use your addition and subtraction skills, combined with some strategic thinking, addiion beat your partner at this game.

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What’s the smartest way to do it? Look at three ‘next door neighbours’ amongst the counting numbers. Two Halves Age 3 to 5 Halving. You can put more than one weight on a hook. There are some families of seven people living in the town. Use five steps to count forwards or backwards in 1s or 10s to get to Can you find out where all the numbers have got to from these ten statements?

# Addition and Subtraction KS1 :

In this problem it is not the squares that jump, you do the jumping! 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. To support this aim, members of the NRICH team work in a wide range of capacities, including probkem professional development for teachers wishing to embed rich mathematical tasks into everyday classroom practice.

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Are these domino games fair? Amy has a box containing domino pieces but she does not think it is a complete set. How could you answer these questions using a picture, with things, with numbers or symbols?

Use the interactivity to help get a feel for this problem and to find out all the possible ways the balls could land. Can you work out how to balance this equaliser? An old game but lots of arithmetic!

# Problem Solving :

How many creatures did he see? Can you find some paths of your own? What numbers could be inside the envelopes? The tasks in this collection encourage children to create, recognise, extend and explain number patterns.

Lots to find out, lots to explore.