You may also like

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

I'm Eight

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

problem icon

Dice and Spinner Numbers

If you had any number of ordinary dice, what are the possible ways of making their totals 6? What would the product of the dice be each time?

Sam's Quick Sum

Stage: 2 Challenge Level: Challenge Level:3 Challenge Level:3 Challenge Level:3

Why do this problem?

This problem is a good context in which to discuss different, and perhaps most efficient, methods of calculation.

Key questions

Why don't you try adding all the one-digit numbers first?
Can you describe what you did?
Are there any quicker ways of doing it?

Possible support

Learners could find the sum of the one-digit whole numbers first and then the two-digit whole numbers instead.