### Whole Numbers Only

Can you work out how many of each kind of pencil this student bought?

### Squaring the Circle

Bluey-green, white and transparent squares with a few odd bits of shapes around the perimeter. But, how many squares are there of each type in the complete circle? Study the picture and make an estimate.

### Interstellar

What number could replace * so that */5 is between 3 and 4?

# Can You Make 100?

##### Age 11 to 14Challenge Level

How many ways can you find to put operation signs ($+$, $-$, $\times$, $\div$) between the digits make $100$?