Add 21/28 and 45/8
1st number: 21/28, 2nd number: 5 5/8
21/28 + 45/8 is 51/8.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 8 is 56
Next, find the equivalent fraction of both fractional numbers with denominator 56 - For the 1st fraction, since 28 × 2 = 56,
21/28 = 21 × 2/28 × 2 = 42/56 - Likewise, for the 2nd fraction, since 8 × 7 = 56,
45/8 = 45 × 7/8 × 7 = 315/56 - Add the two like fractions:
42/56 + 315/56 = 42 + 315/56 = 357/56 - 357/56 simplified gives 51/8
- So, 21/28 + 45/8 = 51/8
In mixed form: 63/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/28+45/8 21/28+90/8 21/56+45/8 21/28+45/16 63/28+45/8 21/84+45/8 21/28+45/24 21/28+45/40 21/28+45/56