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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?

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.