Subtract 7/42 from 20/8
1st number: 2 4/8, 2nd number: 7/42
20/8 - 7/42 is 7/3.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 42 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 42 × 4 = 168,
7/42 = 7 × 4/42 × 4 = 28/168 - Subtract the two like fractions:
420/168 - 28/168 = 420 - 28/168 = 392/168 - After reducing the fraction, the answer is 7/3
- In mixed form: 21/3
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