Subtract 32/40 from 8/42
8/42 - 32/40 is -64/105.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 40 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 42 × 20 = 840,
8/42 = 8 × 20/42 × 20 = 160/840 - Likewise, for the 2nd fraction, since 40 × 21 = 840,
32/40 = 32 × 21/40 × 21 = 672/840 - Subtract the two like fractions:
160/840 - 672/840 = 160 - 672/840 = -512/840 - After reducing the fraction, the answer is -64/105
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