Add 40/42 and 7/8
40/42 + 7/8 is 307/168.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 8 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 42 × 4 = 168,
40/42 = 40 × 4/42 × 4 = 160/168 - Likewise, for the 2nd fraction, since 8 × 21 = 168,
7/8 = 7 × 21/8 × 21 = 147/168 - Add the two like fractions:
160/168 + 147/168 = 160 + 147/168 = 307/168 - So, 40/42 + 7/8 = 307/168
In mixed form: 1139/168
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/42+7/8 40/42+14/8 40/84+7/8 40/42+7/16 40/42+21/8 40/42+7/24 40/42+35/8 40/42+7/40 40/42+49/8 40/42+7/56