Multiplication and division

How much lighter will £5 worth of 5p's be with these new lighter coins?

What could be the scores from five throws of this dice?

There are four equal weights on one side of the scale and an apple on the other side. What can you say that is true about the apple and the weights from the picture?

What is the least square number which commences with six two's?

Find another number that is one short of a square number and when you double it and add 1, the result is also a square number.

Use this information to work out whether the front or back wheel of this bicycle gets more wear and tear.

Use the information to work out how many gifts there are in each pile.

Start by putting one million (1 000 000) into the display of your calculator. Can you reduce this to 7 using just the 7 key and add, subtract, multiply, divide and equals as many times as you like?

Can you explain how Galley Division works?

This challenge asks you to investigate the total number of cards that would be sent if four children send one to all three others. How many would be sent if there were five children? Six?