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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.

By changing only one letter turn the following words into words with a mathematical meaning: CORE, AUDITION, ATTITUDE, ECLIPSE, SQUIRE, TIN, SEVER, FINE

Answer: CONE, ADDITION, ALTITUDE, ELIPSE, SQUARE, TON, SEVEN, FIVE