10: 3 + 7, Half of 20, 20 ÷ 2, 2 x 5, 5 x 2, 100 ÷ 10, Double 5, One quarter of 40, 20 - 10, 9 + 1, 20: 10 x 2, 5 x 4, 40 ÷ 2, Half of 40, 15 + 5, 8 + 12, Double 10, 13 + 7, 2 x 10, 5 + 5 + 5 + 5,

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