Subtract 42/10 from 18/24, Solve 18/24

Subtract 42/10 from 18/24

1^st number: 18/24, 2^nd number: 4 2/10

18/24 - 42/10 is -69/20.

Find the least common denominator or LCM of the two denominators:
LCM of 24 and 10 is 120

Next, find the equivalent fraction of both fractional numbers with denominator 120
For the 1st fraction, since 24 × 5 = 120,
18/24 = 18 × 5/24 × 5 = 90/120
Likewise, for the 2nd fraction, since 10 × 12 = 120,
42/10 = 42 × 12/10 × 12 = 504/120
Subtract the two like fractions:
90/120 - 504/120 = 90 - 504/120 = -414/120
After reducing the fraction, the answer is -69/20

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