Add 1/40 and 21/7
1st number: 1/40, 2nd number: 3 0/7
1/40 + 21/7 is 121/40.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 7 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 40 × 7 = 280,
1/40 = 1 × 7/40 × 7 = 7/280 - Likewise, for the 2nd fraction, since 7 × 40 = 280,
21/7 = 21 × 40/7 × 40 = 840/280 - Add the two like fractions:
7/280 + 840/280 = 7 + 840/280 = 847/280 - 847/280 simplified gives 121/40
- So, 1/40 + 21/7 = 121/40
In mixed form: 31/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/40+21/7 1/40+42/7 1/80+21/7 1/40+21/14 3/40+21/7 1/40+63/7 5/40+21/7 1/40+21/35 7/40+21/7 1/40+21/49