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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.

How can you use six nines to make 100?

Answer: 99+(99÷99); 99+(9x9)÷(9x9); 99+(9+9)÷(9+9); 9x9+9+9+(9÷9); (9÷9+99)x9÷9