Add 21/90 and 1/28
21/90 + 1/28 is 113/420.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 28 is 1260
Next, find the equivalent fraction of both fractional numbers with denominator 1260 - For the 1st fraction, since 90 × 14 = 1260,
21/90 = 21 × 14/90 × 14 = 294/1260 - Likewise, for the 2nd fraction, since 28 × 45 = 1260,
1/28 = 1 × 45/28 × 45 = 45/1260 - Add the two like fractions:
294/1260 + 45/1260 = 294 + 45/1260 = 339/1260 - 339/1260 simplified gives 113/420
- So, 21/90 + 1/28 = 113/420
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/90+1/28 21/90+2/28 21/90+1/56 63/90+1/28 21/90+3/28 21/90+1/84 21/90+5/28 21/90+7/28