Subtract 3/90 from 28/72
28/72 - 3/90 is 16/45.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 90 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 72 × 5 = 360,
28/72 = 28 × 5/72 × 5 = 140/360 - Likewise, for the 2nd fraction, since 90 × 4 = 360,
3/90 = 3 × 4/90 × 4 = 12/360 - Subtract the two like fractions:
140/360 - 12/360 = 140 - 12/360 = 128/360 - After reducing the fraction, the answer is 16/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/72-3/90 28/72-6/90 84/72-3/90 28/72-9/90 28/72-15/90 28/72-21/90