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Puzzle of the Day

These puzzles are also printed in Eight days a week, a booklet published by the Association of Teachers of Mathematics.

What is the number if: (a) it is square (b) one more than the number is a multiple of 10? (You make a square number when you multiply something by itself, so 36 is square because it is 6 times 6)

Answer: 9, 49, 169, ...