Subtract 28/7 from 7/40, Solve 7/40

Subtract 28/7 from 7/40

1^st number: 7/40, 2^nd number: 4 0/7

7/40 - 28/7 is -153/40.

Find the least common denominator or LCM of the two denominators:
LCM of 40 and 7 is 280

Next, find the equivalent fraction of both fractional numbers with denominator 280
For the 1st fraction, since 40 × 7 = 280,
7/40 = 7 × 7/40 × 7 = 49/280
Likewise, for the 2nd fraction, since 7 × 40 = 280,
28/7 = 28 × 40/7 × 40 = 1120/280
Subtract the two like fractions:
49/280 - 1120/280 = 49 - 1120/280 = -1071/280
After reducing the fraction, the answer is -153/40

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