Subtract 30/7 from 21/70
1st number: 21/70, 2nd number: 4 2/7
21/70 - 30/7 is -279/70.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 7 is 70
Next, find the equivalent fraction of both fractional numbers with denominator 70 - For the 1st fraction, since 70 × 1 = 70,
21/70 = 21 × 1/70 × 1 = 21/70 - Likewise, for the 2nd fraction, since 7 × 10 = 70,
30/7 = 30 × 10/7 × 10 = 300/70 - Subtract the two like fractions:
21/70 - 300/70 = 21 - 300/70 = -279/70
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