Subtract 30/50 from 7/40, Solve 7/40

Subtract 30/50 from 7/40

7/40 - 30/50 is -17/40.

Find the least common denominator or LCM of the two denominators:
LCM of 40 and 50 is 200

Next, find the equivalent fraction of both fractional numbers with denominator 200
For the 1st fraction, since 40 × 5 = 200,
7/40 = 7 × 5/40 × 5 = 35/200
Likewise, for the 2nd fraction, since 50 × 4 = 200,
30/50 = 30 × 4/50 × 4 = 120/200
Subtract the two like fractions:
35/200 - 120/200 = 35 - 120/200 = -85/200
After reducing the fraction, the answer is -17/40

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