### I'm Eight

Find a great variety of ways of asking questions which make 8.

### Month Mania

Can you design a new shape for the twenty-eight squares and arrange the numbers in a logical way? What patterns do you notice?

### Magic Plant

On Friday the magic plant was only 2 centimetres tall. Every day it doubled its height. How tall was it on Monday?

# What's Left?

##### Stage: 1 Challenge Level:

Alistair from Histon and Impington Infants School says:

When I coloured all of the numbers that could be shared by 2, the even ones were coloured and the odd numbers were left. Then I coloured all the numbers that could be shared by 3. When I tried the numbers that could be shared by 4, there were no new ones because they were even. When I tried the numbers that could be shared by 5, I found they were already coloured.

Alistair sent us a diagram of his results:

Sim who lives in Singapore explains that the (black) numbers left are 7, 11, 13, 17, and 19, and that they are called prime numbers. Well done.

Sim also points out that 2, 3 and 5 are prime numbers too. I wonder whether anyone can notice something different about 2, the lowest prime number, compared with the others?