Add 1/40 and 21/18
1st number: 1/40, 2nd number: 1 3/18
1/40 + 21/18 is 143/120.
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,
1/40 = 1 × 9/40 × 9 = 9/360 - Likewise, for the 2nd fraction, since 18 × 20 = 360,
21/18 = 21 × 20/18 × 20 = 420/360 - Add the two like fractions:
9/360 + 420/360 = 9 + 420/360 = 429/360 - 429/360 simplified gives 143/120
- So, 1/40 + 21/18 = 143/120
In mixed form: 123/120
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/40+21/18 1/40+42/18 1/80+21/18 1/40+21/36 3/40+21/18 1/40+63/18 1/40+21/54 5/40+21/18 1/40+21/90 7/40+21/18