Subtract 24/30 from 21/70
21/70 - 24/30 is -1/2.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 30 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 70 × 3 = 210,
21/70 = 21 × 3/70 × 3 = 63/210 - Likewise, for the 2nd fraction, since 30 × 7 = 210,
24/30 = 24 × 7/30 × 7 = 168/210 - Subtract the two like fractions:
63/210 - 168/210 = 63 - 168/210 = -105/210 - After reducing the fraction, the answer is -1/2
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