Add 60/40 and 70/21
1st number: 1 20/40, 2nd number: 3 7/21
60/40 + 70/21 is 29/6.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 21 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 40 × 21 = 840,
60/40 = 60 × 21/40 × 21 = 1260/840 - Likewise, for the 2nd fraction, since 21 × 40 = 840,
70/21 = 70 × 40/21 × 40 = 2800/840 - Add the two like fractions:
1260/840 + 2800/840 = 1260 + 2800/840 = 4060/840 - 4060/840 simplified gives 29/6
- So, 60/40 + 70/21 = 29/6
In mixed form: 45/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/80+70/21 60/40+70/42 60/40+70/63