Add 21/28 and 81/25
1st number: 21/28, 2nd number: 3 6/25
21/28 + 81/25 is 399/100.
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,
81/25 = 81 × 28/25 × 28 = 2268/700 - Add the two like fractions:
525/700 + 2268/700 = 525 + 2268/700 = 2793/700 - 2793/700 simplified gives 399/100
- So, 21/28 + 81/25 = 399/100
In mixed form: 399/100
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/28+81/25 21/56+81/25 21/28+81/50 63/28+81/25 21/84+81/25 21/28+81/75