Add 40/42 and 25/8
1st number: 40/42, 2nd number: 3 1/8
40/42 + 25/8 is 685/168.
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,
25/8 = 25 × 21/8 × 21 = 525/168 - Add the two like fractions:
160/168 + 525/168 = 160 + 525/168 = 685/168 - So, 40/42 + 25/8 = 685/168
In mixed form: 413/168
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/42+25/8 40/42+50/8 40/84+25/8 40/42+25/16 40/42+75/8 40/42+25/24 40/42+25/40 40/42+25/56