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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 many different numbers can you make using only the digits 1, 2, 3, 4 and an add sign.? For instance 31+24, or 1+243.

Answer: 37, 46, 55, 64, 73, 127, 136, 145, 217, 235, 244, 316, 325, 343, 415, 424, 433