### Pebbles

Place four pebbles on the sand in the form of a square. Keep adding as few pebbles as necessary to double the area. How many extra pebbles are added each time?

### It Figures

Suppose we allow ourselves to use three numbers less than 10 and multiply them together. How many different products can you find? How do you know you've got them all?

### Bracelets

Investigate the different shaped bracelets you could make from 18 different spherical beads. How do they compare if you use 24 beads?

# Missing Multipliers

##### Age 7 to 14Challenge Level

By clicking on some of the cells to reveal the answers, can you work out what the headings must be?

Once you've worked out what each heading must be, drag the purple numbers to the appropriate spaces. When you think you have cracked it, click "Show the solution" to see if you are right.

What is the smallest number of answers you need to reveal in order to work out the missing headers?

Here are some more Missing Multiplier challenges you might like to try:

6 by 6 grid, using multipliers up to 15

An 8 by 8 grid, using multipliers up to 18

10 by 10 grid, using multipliers up to 20

If you enjoyed this problem you may also enjoy Gabriel's Problem