Add 30/10 and 42/40
1st number: 3 0/10, 2nd number: 1 2/40
30/10 + 42/40 is 81/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 10 and 40 is 40
Next, find the equivalent fraction of both fractional numbers with denominator 40 - For the 1st fraction, since 10 × 4 = 40,
30/10 = 30 × 4/10 × 4 = 120/40 - Likewise, for the 2nd fraction, since 40 × 1 = 40,
42/40 = 42 × 1/40 × 1 = 42/40 - Add the two like fractions:
120/40 + 42/40 = 120 + 42/40 = 162/40 - 162/40 simplified gives 81/20
- So, 30/10 + 42/40 = 81/20
In mixed form: 41/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/10+42/40 30/10+84/40 30/20+42/40 30/10+42/80 90/10+42/40 30/50+42/40 30/70+42/40