Add 70/40 and 21/9
1st number: 1 30/40, 2nd number: 2 3/9
70/40 + 21/9 is 49/12.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 9 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 40 × 9 = 360,
70/40 = 70 × 9/40 × 9 = 630/360 - Likewise, for the 2nd fraction, since 9 × 40 = 360,
21/9 = 21 × 40/9 × 40 = 840/360 - Add the two like fractions:
630/360 + 840/360 = 630 + 840/360 = 1470/360 - 1470/360 simplified gives 49/12
- So, 70/40 + 21/9 = 49/12
In mixed form: 41/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/40+42/9 70/80+21/9 70/40+21/18 70/40+63/9 70/40+21/27 70/40+21/45 70/40+21/63