Add 21/28 and 18/32
21/28 + 18/32 is 21/16.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 32 is 224
Next, find the equivalent fraction of both fractional numbers with denominator 224 - For the 1st fraction, since 28 × 8 = 224,
21/28 = 21 × 8/28 × 8 = 168/224 - Likewise, for the 2nd fraction, since 32 × 7 = 224,
18/32 = 18 × 7/32 × 7 = 126/224 - Add the two like fractions:
168/224 + 126/224 = 168 + 126/224 = 294/224 - 294/224 simplified gives 21/16
- So, 21/28 + 18/32 = 21/16
In mixed form: 15/16
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/28+18/32 21/28+36/32 21/56+18/32 21/28+18/64 63/28+18/32 21/28+54/32 21/84+18/32 21/28+18/96 21/28+90/32