Add 21/28 and 40/25
1st number: 21/28, 2nd number: 1 15/25
21/28 + 40/25 is 47/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 25 is 700
Next, find the equivalent fraction of both fractional numbers with denominator 700 - For the 1st fraction, since 28 × 25 = 700,
21/28 = 21 × 25/28 × 25 = 525/700 - Likewise, for the 2nd fraction, since 25 × 28 = 700,
40/25 = 40 × 28/25 × 28 = 1120/700 - Add the two like fractions:
525/700 + 1120/700 = 525 + 1120/700 = 1645/700 - 1645/700 simplified gives 47/20
- So, 21/28 + 40/25 = 47/20
In mixed form: 27/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/28+40/25 21/28+80/25 21/56+40/25 21/28+40/50 63/28+40/25 21/84+40/25 21/28+40/75