Subtract 40/70 from 21/8
1st number: 2 5/8, 2nd number: 40/70
21/8 - 40/70 is 115/56.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 70 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 8 × 35 = 280,
21/8 = 21 × 35/8 × 35 = 735/280 - Likewise, for the 2nd fraction, since 70 × 4 = 280,
40/70 = 40 × 4/70 × 4 = 160/280 - Subtract the two like fractions:
735/280 - 160/280 = 735 - 160/280 = 575/280 - After reducing the fraction, the answer is 115/56
- In mixed form: 23/56
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