Add 40/21 and 72/70
1st number: 1 19/21, 2nd number: 1 2/70
40/21 + 72/70 is 44/15.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 70 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 21 × 10 = 210,
40/21 = 40 × 10/21 × 10 = 400/210 - Likewise, for the 2nd fraction, since 70 × 3 = 210,
72/70 = 72 × 3/70 × 3 = 216/210 - Add the two like fractions:
400/210 + 216/210 = 400 + 216/210 = 616/210 - 616/210 simplified gives 44/15
- So, 40/21 + 72/70 = 44/15
In mixed form: 214/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/21+72/70 40/42+72/70 40/63+72/70