Add 40/6 and 18/21
1st number: 6 4/6, 2nd number: 18/21
40/6 + 18/21 is 158/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 6 and 21 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 6 × 7 = 42,
40/6 = 40 × 7/6 × 7 = 280/42 - Likewise, for the 2nd fraction, since 21 × 2 = 42,
18/21 = 18 × 2/21 × 2 = 36/42 - Add the two like fractions:
280/42 + 36/42 = 280 + 36/42 = 316/42 - 316/42 simplified gives 158/21
- So, 40/6 + 18/21 = 158/21
In mixed form: 711/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/6+18/21 40/6+36/21 40/12+18/21 40/6+18/42 40/6+54/21 40/18+18/21 40/6+18/63 40/6+90/21 40/30+18/21 40/42+18/21