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Sam's Quick Sum

Age 7 to 11 Challenge Level:

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.