Subtract 4/90 from 21/24
21/24 - 4/90 is 299/360.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 24 and 90 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 24 × 15 = 360,
21/24 = 21 × 15/24 × 15 = 315/360 - Likewise, for the 2nd fraction, since 90 × 4 = 360,
4/90 = 4 × 4/90 × 4 = 16/360 - Subtract the two like fractions:
315/360 - 16/360 = 315 - 16/360 = 299/360
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/24-4/90 21/24-8/90 21/48-4/90 63/24-4/90 21/24-12/90 21/72-4/90 21/24-20/90 21/24-28/90