Subtract 27/90 from 24/42
24/42 - 27/90 is 19/70.
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,
24/42 = 24 × 15/42 × 15 = 360/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
27/90 = 27 × 7/90 × 7 = 189/630 - Subtract the two like fractions:
360/630 - 189/630 = 360 - 189/630 = 171/630 - After reducing the fraction, the answer is 19/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 48/42-27/90 24/42-54/90 24/84-27/90 72/42-27/90 24/42-81/90