Add 42/30 and 28/40
1st number: 1 12/30, 2nd number: 28/40
42/30 + 28/40 is 21/10.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 40 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 30 × 4 = 120,
42/30 = 42 × 4/30 × 4 = 168/120 - Likewise, for the 2nd fraction, since 40 × 3 = 120,
28/40 = 28 × 3/40 × 3 = 84/120 - Add the two like fractions:
168/120 + 84/120 = 168 + 84/120 = 252/120 - 252/120 simplified gives 21/10
- So, 42/30 + 28/40 = 21/10
In mixed form: 21/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/30+28/40 42/30+56/40 42/60+28/40 42/30+28/80 42/30+84/40 42/90+28/40