Subtract 70/42 from 7/40
1st number: 7/40, 2nd number: 1 28/42
7/40 - 70/42 is -179/120.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 42 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 40 × 21 = 840,
7/40 = 7 × 21/40 × 21 = 147/840 - Likewise, for the 2nd fraction, since 42 × 20 = 840,
70/42 = 70 × 20/42 × 20 = 1400/840 - Subtract the two like fractions:
147/840 - 1400/840 = 147 - 1400/840 = -1253/840 - After reducing the fraction, the answer is -179/120
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