Year 4 Explaining, convincing and proving

This activity challenges you to decide on the 'best' number to use in each statement. You may need to do some estimating, some calculating and some research.

In this activity, the computer chooses a times table and shifts it. Can you work out the table and the shift each time?

This practical problem challenges you to make quadrilaterals with a loop of string. You'll need some friends to help!

Ten cards are put into five envelopes so that there are two cards in each envelope. The sum of the numbers inside it is written on each envelope. What numbers could be inside the envelopes?

I'm thinking of a number. My number is both a multiple of 5 and a multiple of 6. What could my number be?