Add 30/25 and 21/28
1st number: 1 5/25, 2nd number: 21/28
30/25 + 21/28 is 39/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 25 and 28 is 700
Next, find the equivalent fraction of both fractional numbers with denominator 700 - For the 1st fraction, since 25 × 28 = 700,
30/25 = 30 × 28/25 × 28 = 840/700 - Likewise, for the 2nd fraction, since 28 × 25 = 700,
21/28 = 21 × 25/28 × 25 = 525/700 - Add the two like fractions:
840/700 + 525/700 = 840 + 525/700 = 1365/700 - 1365/700 simplified gives 39/20
- So, 30/25 + 21/28 = 39/20
In mixed form: 119/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/25+21/28 30/25+42/28 30/50+21/28 30/25+21/56 90/25+21/28 30/25+63/28 30/75+21/28 30/25+21/84