Subtract 42/90 from 8/56
8/56 - 42/90 is -34/105.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 56 and 90 is 2520
Next, find the equivalent fraction of both fractional numbers with denominator 2520 - For the 1st fraction, since 56 × 45 = 2520,
8/56 = 8 × 45/56 × 45 = 360/2520 - Likewise, for the 2nd fraction, since 90 × 28 = 2520,
42/90 = 42 × 28/90 × 28 = 1176/2520 - Subtract the two like fractions:
360/2520 - 1176/2520 = 360 - 1176/2520 = -816/2520 - After reducing the fraction, the answer is -34/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/56-42/90 8/56-84/90 24/56-42/90 40/56-42/90