Subtract 15/8 from 40/81
1st number: 40/81, 2nd number: 1 7/8
40/81 - 15/8 is -895/648.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 8 is 648
Next, find the equivalent fraction of both fractional numbers with denominator 648 - For the 1st fraction, since 81 × 8 = 648,
40/81 = 40 × 8/81 × 8 = 320/648 - Likewise, for the 2nd fraction, since 8 × 81 = 648,
15/8 = 15 × 81/8 × 81 = 1215/648 - Subtract the two like fractions:
320/648 - 1215/648 = 320 - 1215/648 = -895/648
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