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71.9 = (7 x 10) + (1 x 1) + (9/10).
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This means that you should write your answer using fractional notation as opposed to decimal notation. For example, you would write 1/4 instead of .25 .
0.8 = 8 × 0.1 = 8 × 1/10
71.9 = (7 x 10) + (1 x 1) + (9/10).