Add 30/8 and 18/42
1st number: 3 6/8, 2nd number: 18/42
30/8 + 18/42 is 117/28.
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,
30/8 = 30 × 21/8 × 21 = 630/168 - Likewise, for the 2nd fraction, since 42 × 4 = 168,
18/42 = 18 × 4/42 × 4 = 72/168 - Add the two like fractions:
630/168 + 72/168 = 630 + 72/168 = 702/168 - 702/168 simplified gives 117/28
- So, 30/8 + 18/42 = 117/28
In mixed form: 45/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/8+18/42 30/8+36/42 30/16+18/42 30/8+18/84 90/8+18/42 30/8+54/42 30/24+18/42 30/8+90/42 30/40+18/42 30/56+18/42