Subtract 30/40 from 56/90
56/90 - 30/40 is -23/180.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 40 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 90 × 4 = 360,
56/90 = 56 × 4/90 × 4 = 224/360 - Likewise, for the 2nd fraction, since 40 × 9 = 360,
30/40 = 30 × 9/40 × 9 = 270/360 - Subtract the two like fractions:
224/360 - 270/360 = 224 - 270/360 = -46/360 - After reducing the fraction, the answer is -23/180
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/90-60/40 56/90-30/80 56/90-90/40