Subtract 21/30 from 72/63
1st number: 1 9/63, 2nd number: 21/30
72/63 - 21/30 is 31/70.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 63 and 30 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 63 × 10 = 630,
72/63 = 72 × 10/63 × 10 = 720/630 - Likewise, for the 2nd fraction, since 30 × 21 = 630,
21/30 = 21 × 21/30 × 21 = 441/630 - Subtract the two like fractions:
720/630 - 441/630 = 720 - 441/630 = 279/630 - After reducing the fraction, the answer is 31/70
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