Subtract 18/90 from 4/56
4/56 - 18/90 is -9/70.
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,
4/56 = 4 × 45/56 × 45 = 180/2520 - Likewise, for the 2nd fraction, since 90 × 28 = 2520,
18/90 = 18 × 28/90 × 28 = 504/2520 - Subtract the two like fractions:
180/2520 - 504/2520 = 180 - 504/2520 = -324/2520 - After reducing the fraction, the answer is -9/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/56-18/90 4/56-36/90 12/56-18/90 4/56-54/90 20/56-18/90 28/56-18/90