Multiplication and division

problem
An easy way to multiply by 10?

Age

7 to 11

Challenge level

Do you agree with Badger's statements? Is Badger's reasoning 'watertight'? Why or why not?
problem
Napier's bones

Age

7 to 11

Challenge level

The Scot, John Napier, invented these strips about 400 years ago to help calculate multiplication and division. Can you work out how to use Napier's bones to find the answer to these multiplications?
game
Favourite

Dicey array

Age

5 to 11

Challenge level

Watch the video of this game being played. Can you work out the rules? Which dice totals are good to get, and why?
article
Getting the balance right

In this article for primary teachers, Ems shares some common misconceptions surrounding the equals sign, and suggests ways to help learners develop their understanding.
interactivity
Interactive balance

Age

5 to 11

Challenge level

In this simulation of a balance, you can drag numbers and parts of number sentences on to the trays. Have a play!
problem
Are you well balanced?

Age

5 to 7

Challenge level

Can you work out how to make each side of this balance equally balanced? You can put more than one weight on a hook.
problem
Compare the calculations

Age

7 to 11

Challenge level

Can you put these four calculations into order of difficulty? How did you decide?
problem
Picture your method

Age

7 to 11

Challenge level

Can you match these calculation methods to their visual representations?
article
Let's get flexible!

In this article for primary teachers, Ems outlines how we can encourage learners to be flexible in their approach to calculation, and why this is crucial.
$Countdown fractions$

problem
Countdown fractions

Age

11 to 16

Challenge level

Here is a chance to play a fractions version of the classic Countdown Game.