Subtract 4/40 from 28/90
28/90 - 4/40 is 19/90.
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,
28/90 = 28 × 4/90 × 4 = 112/360 - Likewise, for the 2nd fraction, since 40 × 9 = 360,
4/40 = 4 × 9/40 × 9 = 36/360 - Subtract the two like fractions:
112/360 - 36/360 = 112 - 36/360 = 76/360 - After reducing the fraction, the answer is 19/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/90-4/40 28/90-8/40 28/90-4/80 84/90-4/40 28/90-12/40 28/90-20/40 28/90-28/40