Subtract 21/10 from 42/63
1st number: 42/63, 2nd number: 2 1/10
42/63 - 21/10 is -43/30.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 63 and 10 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 63 × 10 = 630,
42/63 = 42 × 10/63 × 10 = 420/630 - Likewise, for the 2nd fraction, since 10 × 63 = 630,
21/10 = 21 × 63/10 × 63 = 1323/630 - Subtract the two like fractions:
420/630 - 1323/630 = 420 - 1323/630 = -903/630 - After reducing the fraction, the answer is -43/30
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