Lots to find out, lots to explore. First Connect Three game for an adult and child. Ram divided 15 pennies among four small bags. Journeys in Numberland 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. Look at what happens when you take a number, square it and subtract your answer.

Can you find all the ways to get 15 at the top of this triangle of numbers? What was Annie’s secret number? What numbers could be inside the envelopes? They are our favourites because they really get you thinking mathematically. Weighted Numbers Age 5 to 7 Challenge Level: This challenge combines addition, multiplication, perseverance and even proof. She arranged the cards into 6 unequal piles where each pile added to the same total.

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.

Countdown Age 7 to 14 Challenge Level: Can you estimate what the size of the last four numbers will be? Three Neighbours Age 7 to 11 Challenge Level: You may also like Double Digit Choose two digits and arrange them to make two double-digit numbers.

The article provides a summary of the elementary ideas about vectors usually met in school mathematics, describes what vectors are and how to add, subtract and multiply them by scalars and indicates. Tom and Ben visited Numberland.

# Problem Solving :

Try out some calculations. This ke2 of games will support understanding of number. Addition and Subtraction Age 7 to 11 Have a go at these upper primary activities which all involve addition, subtraction or both.

Subyraction, Sometimes or Never? Cryptarithms Age 11 to 14 Challenge Level: Consecutive Numbers Age 7 to 14 Challenge Level: Can you go through this maze so that the numbers you pass add to exactly ? She arranged the cards into 6 unequal piles where each pile added to the same total. Use the cards to gather all the information you need.

# Square Subtraction :

Try out some calculations. Money Bags Age 5 to 11 Challenge Sugtraction Number Facts Age 7 to 11 This feature gathers together activities which will help you get better at knowing and using number facts. Addition and Subtraction KS2 Age 7 to 11 The upper primary tasks in this collection all focus on adding and subtracting.

The lower primary tasks in this collection could each be solved by working backwards. When my number is divided by 5 the remainder is 4.

An investigation involving adding and subtracting sets of consecutive numbers.

## Kangaroo Subtraction

Ram divided 15 pennies among four small bags. There are three baskets, a brown one, a red one and a pink one, holding a total of 10 eggs.

In this article, Jennie suggests that we can support this process in three principal ways. KS1 Age 5 to 7 Challenge Level: Four bags contain a large number of 1s, 3s, 5s and 7s. Can you prove it?

## Problem Solving

Conjecturing and Generalising at KS1 Age 5 to 7 The tasks in this collection encourage lower primary children to conjecture and generalise. This challenge is about finding the difference between numbers which have the same tens digit.

How many pennies did Ram put in each bag?

The fourth article builds on the third by discussing what we mean by problem-solving skills and how NRICH can help children develop these skills. Charlie and Abi put a counter on This addition sum uses all ten digits 0, 1,