Add 36/28 and 21/40
1st number: 1 8/28, 2nd number: 21/40
36/28 + 21/40 is 507/280.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 40 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 28 × 10 = 280,
36/28 = 36 × 10/28 × 10 = 360/280 - Likewise, for the 2nd fraction, since 40 × 7 = 280,
21/40 = 21 × 7/40 × 7 = 147/280 - Add the two like fractions:
360/280 + 147/280 = 360 + 147/280 = 507/280 - So, 36/28 + 21/40 = 507/280
In mixed form: 1227/280
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/28+21/40 36/28+42/40 36/56+21/40 36/28+21/80 36/28+63/40 36/84+21/40