Subtract 56/8 from 18/42
1st number: 18/42, 2nd number: 7 0/8
18/42 - 56/8 is -46/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 8 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 42 × 4 = 168,
18/42 = 18 × 4/42 × 4 = 72/168 - Likewise, for the 2nd fraction, since 8 × 21 = 168,
56/8 = 56 × 21/8 × 21 = 1176/168 - Subtract the two like fractions:
72/168 - 1176/168 = 72 - 1176/168 = -1104/168 - After reducing the fraction, the answer is -46/7
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