Add 21/25 and 28/40
21/25 + 28/40 is 77/50.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 25 and 40 is 200
Next, find the equivalent fraction of both fractional numbers with denominator 200 - For the 1st fraction, since 25 × 8 = 200,
21/25 = 21 × 8/25 × 8 = 168/200 - Likewise, for the 2nd fraction, since 40 × 5 = 200,
28/40 = 28 × 5/40 × 5 = 140/200 - Add the two like fractions:
168/200 + 140/200 = 168 + 140/200 = 308/200 - 308/200 simplified gives 77/50
- So, 21/25 + 28/40 = 77/50
In mixed form: 127/50
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/25+28/40 21/25+56/40 21/50+28/40 21/25+28/80 63/25+28/40 21/25+84/40 21/75+28/40