Add 21/56 and 42/60
21/56 + 42/60 is 43/40.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 56 and 60 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 56 × 15 = 840,
21/56 = 21 × 15/56 × 15 = 315/840 - Likewise, for the 2nd fraction, since 60 × 14 = 840,
42/60 = 42 × 14/60 × 14 = 588/840 - Add the two like fractions:
315/840 + 588/840 = 315 + 588/840 = 903/840 - 903/840 simplified gives 43/40
- So, 21/56 + 42/60 = 43/40
In mixed form: 13/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/56+42/60 21/56+84/60 63/56+42/60