Subtract 3/90 from 18/42
18/42 - 3/90 is 83/210.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 90 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 42 × 15 = 630,
18/42 = 18 × 15/42 × 15 = 270/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
3/90 = 3 × 7/90 × 7 = 21/630 - Subtract the two like fractions:
270/630 - 21/630 = 270 - 21/630 = 249/630 - After reducing the fraction, the answer is 83/210
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