Using the information given, can you replace the stars in the calculation with figures? Curious Number Age 7 to 11 Challenge Level: Charlie chooses three of them that add together to make a multiple of three. Choose a symbol to put into the number sentence. Each light in this interactivity turns on according to a rule. How about every third point?

Peaches Today, Peaches Tomorrow Is there only one solution in each case? Pick any ten numbers from the bags above so that their total is Knapsack Age 14 to 16 Challenge Level: Look at what happens when you take a number, square it and subtract your answer. The tasks in this collection encourage upper primary children to look deeper at multiplication and division. It is the sort of problem that needs thinking time – but once the connection is made it gives access to many similar ideas.

How Do You Do It?

Ip Dip Age 5 to 11 Challenge Level: What do you think is happening to the numbers? This big box multiplies anything that goes inside it by the same number. Age 5 k2 Working Systematically at KS2.

Strike it Out game for an adult and child. How many ways can you find to do up all four buttons on my coat?

# The Remainders Game :

Have a go at balancing this equation. Legs Eleven Age 11 to 14 Challenge Level: Can you prove it? Do you know a quick way nric check if a number is a multiple of two? Can you choose sets of numbers to collect so that you spin six numbers belonging to your sets in as few spins as possible?

What Are Complex Numbers? Do you notice anything interesting about your results? Four Go game for an adult and child. Working on the building blocks will help you to explain what is special about your results.

# Working Systematically at KS2 :

An example of a simple Public Key digision, called the Knapsack Code is described in this article, alongside some information on its origins. What Numbers Can We Make? Take any four digit number. Number and Calculation Age 5 to 11 These articles will support primary teachers as they develop children’s understanding of number and calculation.

Dicey Operations for an adult and child.

What questions would you like to ask? Number and Calculation Age 5 to 11 These articles will support primary teachers as they develop children’s understanding of number and calculation.

## The Remainders Game

What kind of number do you get? What is the value of the digit M? Mobile Numbers Age 5 to 11 Challenge Level: Sweets in a Box Age 7 to 11 Challenge Level: In Level 3 the probem number will be from 1 to inclusive and you can only divide by a selection of the numbers from 1 to Kss2 did this work? When Charlie asked his grandmother how old she is, he didn’t get a straightforward reply!

Try with different numbers of squares around the ring. Knapsack Age 14 to 16 Challenge Level: Can divisipn work out how long it is between each super-eclipse? Sending Cards This challenge asks you to investigate the total number of cards that would be sent if four children send one to all three others.