Add 70/40 and 21/60
1st number: 1 30/40, 2nd number: 21/60
70/40 + 21/60 is 21/10.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 60 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 60 × 2 = 120,
21/60 = 21 × 2/60 × 2 = 42/120 - Add the two like fractions:
210/120 + 42/120 = 210 + 42/120 = 252/120 - 252/120 simplified gives 21/10
- So, 70/40 + 21/60 = 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: 70/40+42/60 70/80+21/60 70/40+63/60