Subtract 90/40 from 5/30, Solve 5/30

Subtract 90/40 from 5/30

1^st number: 5/30, 2^nd number: 2 10/40

5/30 - 90/40 is -25/12.

Find the least common denominator or LCM of the two denominators:
LCM of 30 and 40 is 120

Next, find the equivalent fraction of both fractional numbers with denominator 120
For the 1st fraction, since 30 × 4 = 120,
5/30 = 5 × 4/30 × 4 = 20/120
Likewise, for the 2nd fraction, since 40 × 3 = 120,
90/40 = 90 × 3/40 × 3 = 270/120
Subtract the two like fractions:
20/120 - 270/120 = 20 - 270/120 = -250/120
After reducing the fraction, the answer is -25/12

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