Subtract 15/40 from 4/18, Solve 4/18

Subtract 15/40 from 4/18

4/18 - 15/40 is -11/72.

Find the least common denominator or LCM of the two denominators:
LCM of 18 and 40 is 360

Next, find the equivalent fraction of both fractional numbers with denominator 360
For the 1st fraction, since 18 × 20 = 360,
4/18 = 4 × 20/18 × 20 = 80/360
Likewise, for the 2nd fraction, since 40 × 9 = 360,
15/40 = 15 × 9/40 × 9 = 135/360
Subtract the two like fractions:
80/360 - 135/360 = 80 - 135/360 = -55/360
After reducing the fraction, the answer is -11/72

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