You may also like

problem icon

Prompt Cards

These two group activities use mathematical reasoning - one is numerical, one geometric.

problem icon

Exploring Wild & Wonderful Number Patterns

EWWNP means Exploring Wild and Wonderful Number Patterns Created by Yourself! Investigate what happens if we create number patterns using some simple rules.

problem icon


Place this "worm" on the 100 square and find the total of the four squares it covers. Keeping its head in the same place, what other totals can you make?

A Dotty Problem

Age 7 to 11 Challenge Level:

A Dotty Problem

Starting with the number $180$, take away $9$ again and again, joining up the dots as you go.

Watch out - don't join all the dots!

If you can see this message Flash may not be working in your browser
Please see to enable it.

Why do this problem?

This problem is a different way of practising the nine times table. It also provides a context in which you can discuss mental strategies for taking away nine.

Key questions

What do you get if you take away nine from that number?
How could you work it out?
Can you think of another way to do it?

Possible extension

Children could make their own version for counting backwards in twelves.