Add 42/8 and 40/30
1st number: 5 2/8, 2nd number: 1 10/30
42/8 + 40/30 is 79/12.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 30 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 8 × 15 = 120,
42/8 = 42 × 15/8 × 15 = 630/120 - Likewise, for the 2nd fraction, since 30 × 4 = 120,
40/30 = 40 × 4/30 × 4 = 160/120 - Add the two like fractions:
630/120 + 160/120 = 630 + 160/120 = 790/120 - 790/120 simplified gives 79/12
- So, 42/8 + 40/30 = 79/12
In mixed form: 67/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/8+40/30 42/8+80/30 42/16+40/30 42/8+40/60 42/24+40/30 42/8+40/90 42/40+40/30 42/56+40/30