Add 40/8 and 18/42
1st number: 5 0/8, 2nd number: 18/42
40/8 + 18/42 is 38/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 42 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 8 × 21 = 168,
40/8 = 40 × 21/8 × 21 = 840/168 - Likewise, for the 2nd fraction, since 42 × 4 = 168,
18/42 = 18 × 4/42 × 4 = 72/168 - Add the two like fractions:
840/168 + 72/168 = 840 + 72/168 = 912/168 - 912/168 simplified gives 38/7
- So, 40/8 + 18/42 = 38/7
In mixed form: 53/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/8+18/42 40/8+36/42 40/16+18/42 40/8+18/84 40/8+54/42 40/24+18/42 40/8+90/42 40/56+18/42