Subtract 18/40 from 28/7
1st number: 4 0/7, 2nd number: 18/40
28/7 - 18/40 is 71/20.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 40 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 7 × 40 = 280,
28/7 = 28 × 40/7 × 40 = 1120/280 - Likewise, for the 2nd fraction, since 40 × 7 = 280,
18/40 = 18 × 7/40 × 7 = 126/280 - Subtract the two like fractions:
1120/280 - 126/280 = 1120 - 126/280 = 994/280 - After reducing the fraction, the answer is 71/20
- In mixed form: 311/20
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