100squareA hundred square has been printed on both sides of a piece of paper.

One square is directly behind the other.

What is on the back of 100? 58? 23? 19?

Can you see a pattern?

Click here for the HUNDRED SQUARE Notes for Teachers.

Click here for the HUNDRED SQUARE worksheet

Click here for the AIMINH HIGH poster for your classroom wall.

Click here for a 1-400 square

This problem is also available in French.

This problem is adapted from the NRICH task by the same name with permission of the University of Cambridge. All rights reserved.

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