## NRICH PROBLEM SOLVING KS1 ADDITION

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. Number Pyramids Age 11 to 14 Challenge Level: Carrying Cards Age 7 to 11 Challenge Level: Which totals can you make? Number Lines Age 5 to 7 Challenge Level: As you come down the ladders of the Tall Tower you collect useful spells. Maisy Goes Camping Age 3 to 5 Using everyday language to talk about addition and subtraction.

In this game the winner is the first to complete a row of three. Ahmed is making rods using different numbers of cubes. If you know the numbers that come out, what addition might be going on in the box? Next Domino Age 5 to 7 Challenge Level: Heads and Feet Age 5 to 7 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. Can you work out where their counters will land?

# Multiplication and Division KS1 :

Writing Digits Age 5 to 7 Challenge Level: There are three baskets, a brown one, a red one and a pink one, holding a total of 10 eggs. In this calculation, the box represents a missing digit. Which will you do so that you get to splving end of the number line first? Maths Story Time Age 3 to 5 Telling a story to provoke mathematical discussion, language and reasoning.

The idea of this game is to add or subtract the two numbers on the dice and cover the result on the grid, trying to get a acdition of three. Domino Square Age 7 to 11 Challenge Level: Try entering different sets of numbers in the number pyramids.

## Problem Solving

Amy’s Dominoes Age 7 to 11 Challenge Level: This additionn focuses on doubling multiples of five. What is the same? What numbers of total spots can you make? The idea is to change the colour of all the spots on the grid.

This article offers you practical ways to investigate aspects of your classroom culture.

Always, Sometimes or Never? Talk to your friends about how you work them out.

Sealed Solution Age 7 to 11 Challenge Level: Can you ptoblem the chosen number from the grid using the clues? What strategies did you use? Find the Difference Age 5 to 7 Challenge Level: KS1 Age 5 to 7 Challenge Level: 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 one on the flower? Dotty Six priblem a simple dice game that you can adapt in many ways.

As you come down the ladders of the Tall Tower you collect useful spells. Can you use the numbers on the dice to reach your end of the number line before your partner beats you?

# Problem Solving :

The sum of each side of the triangle should equal the number in its centre. Can you explain why? Use the number weights to find different ways of balancing the equaliser. What do you notice? Shut the Box Age 5 to 7 Challenge Level: What’s the smartest way to do it?

## Adding and Taking Away

Have a go at this well-known challenge. Prolbem from the end sounds rather strange, but in fact can be a very useful problem-solving skill. Adding and Subtracting Positive and Negative Numbers Age 11 to 14 How can we help students make sense of addition and subtraction of negative numbers? Are these statements relating to odd and even numbers always true, sometimes true or never true?

Dicey Addition Age 5 to 11 Challenge Level: This investigates one particular property of number by looking closely at an example of adding two problm numbers together.