Subtract 21/70 from 4/36
4/36 - 21/70 is -17/90.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 36 and 70 is 1260
Next, find the equivalent fraction of both fractional numbers with denominator 1260 - For the 1st fraction, since 36 × 35 = 1260,
4/36 = 4 × 35/36 × 35 = 140/1260 - Likewise, for the 2nd fraction, since 70 × 18 = 1260,
21/70 = 21 × 18/70 × 18 = 378/1260 - Subtract the two like fractions:
140/1260 - 378/1260 = 140 - 378/1260 = -238/1260 - After reducing the fraction, the answer is -17/90
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