10: 1 x 10 =, 2 x 5 =, 10 x 1 =, 20: 2 x 10 =, 4 x 5 =, 8 x 2 =, 30: 5 x 6 =, 10 x 3 =, 11 x 2 =, 40: 10 x 4 =, 5 x 8 =, 50: 5 x 10 =, 10 x 5 =,

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