Subtract 4/21 from 20/8
1st number: 2 4/8, 2nd number: 4/21
20/8 - 4/21 is 97/42.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 21 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 8 × 21 = 168,
20/8 = 20 × 21/8 × 21 = 420/168 - Likewise, for the 2nd fraction, since 21 × 8 = 168,
4/21 = 4 × 8/21 × 8 = 32/168 - Subtract the two like fractions:
420/168 - 32/168 = 420 - 32/168 = 388/168 - After reducing the fraction, the answer is 97/42
- In mixed form: 213/42
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