Subtract 42/9 from 3/21
1st number: 3/21, 2nd number: 4 6/9
3/21 - 42/9 is -95/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 9 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 21 × 3 = 63,
3/21 = 3 × 3/21 × 3 = 9/63 - Likewise, for the 2nd fraction, since 9 × 7 = 63,
42/9 = 42 × 7/9 × 7 = 294/63 - Subtract the two like fractions:
9/63 - 294/63 = 9 - 294/63 = -285/63 - After reducing the fraction, the answer is -95/21
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