Add 42/40 and 21/18
1st number: 1 2/40, 2nd number: 1 3/18
42/40 + 21/18 is 133/60.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 18 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 40 × 9 = 360,
42/40 = 42 × 9/40 × 9 = 378/360 - Likewise, for the 2nd fraction, since 18 × 20 = 360,
21/18 = 21 × 20/18 × 20 = 420/360 - Add the two like fractions:
378/360 + 420/360 = 378 + 420/360 = 798/360 - 798/360 simplified gives 133/60
- So, 42/40 + 21/18 = 133/60
In mixed form: 213/60
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/40+21/18 42/40+42/18 42/80+21/18 42/40+21/36 42/40+63/18 42/40+21/54 42/40+21/90