Add 70/40 and 21/30
1st number: 1 30/40, 2nd number: 21/30
70/40 + 21/30 is 49/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 30 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 40 × 3 = 120,
70/40 = 70 × 3/40 × 3 = 210/120 - Likewise, for the 2nd fraction, since 30 × 4 = 120,
21/30 = 21 × 4/30 × 4 = 84/120 - Add the two like fractions:
210/120 + 84/120 = 210 + 84/120 = 294/120 - 294/120 simplified gives 49/20
- So, 70/40 + 21/30 = 49/20
In mixed form: 29/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/40+42/30 70/80+21/30 70/40+21/60 70/40+63/30 70/40+21/90