Add 18/40 and 21/25
18/40 + 21/25 is 129/100.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 25 is 200
Next, find the equivalent fraction of both fractional numbers with denominator 200 - For the 1st fraction, since 40 × 5 = 200,
18/40 = 18 × 5/40 × 5 = 90/200 - Likewise, for the 2nd fraction, since 25 × 8 = 200,
21/25 = 21 × 8/25 × 8 = 168/200 - Add the two like fractions:
90/200 + 168/200 = 90 + 168/200 = 258/200 - 258/200 simplified gives 129/100
- So, 18/40 + 21/25 = 129/100
In mixed form: 129/100
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/40+21/25 18/40+42/25 18/80+21/25 18/40+21/50 54/40+21/25 18/40+63/25 18/40+21/75 90/40+21/25