Subtract 40/21 from 70/63
1st number: 1 7/63, 2nd number: 1 19/21
70/63 - 40/21 is -50/63.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 63 and 21 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 63 × 1 = 63,
70/63 = 70 × 1/63 × 1 = 70/63 - Likewise, for the 2nd fraction, since 21 × 3 = 63,
40/21 = 40 × 3/21 × 3 = 120/63 - Subtract the two like fractions:
70/63 - 120/63 = 70 - 120/63 = -50/63
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