Subtract 21/30 from 25/70
25/70 - 21/30 is -12/35.
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,
25/70 = 25 × 3/70 × 3 = 75/210 - Likewise, for the 2nd fraction, since 30 × 7 = 210,
21/30 = 21 × 7/30 × 7 = 147/210 - Subtract the two like fractions:
75/210 - 147/210 = 75 - 147/210 = -72/210 - After reducing the fraction, the answer is -12/35
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