Add 40/12 and 3/7
1st number: 3 4/12, 2nd number: 3/7
40/12 + 3/7 is 79/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 7 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 12 × 7 = 84,
40/12 = 40 × 7/12 × 7 = 280/84 - Likewise, for the 2nd fraction, since 7 × 12 = 84,
3/7 = 3 × 12/7 × 12 = 36/84 - Add the two like fractions:
280/84 + 36/84 = 280 + 36/84 = 316/84 - 316/84 simplified gives 79/21
- So, 40/12 + 3/7 = 79/21
In mixed form: 316/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/12+3/7 40/12+6/7 40/24+3/7 40/12+3/14 40/12+9/7 40/36+3/7 40/12+3/21 40/12+15/7 40/60+3/7 40/12+3/35 40/12+21/7 40/84+3/7 40/12+3/49