Add 70/21 and 20/18
1st number: 3 7/21, 2nd number: 1 2/18
70/21 + 20/18 is 40/9.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 18 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 21 × 6 = 126,
70/21 = 70 × 6/21 × 6 = 420/126 - Likewise, for the 2nd fraction, since 18 × 7 = 126,
20/18 = 20 × 7/18 × 7 = 140/126 - Add the two like fractions:
420/126 + 140/126 = 420 + 140/126 = 560/126 - 560/126 simplified gives 40/9
- So, 70/21 + 20/18 = 40/9
In mixed form: 44/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/21+40/18 70/42+20/18 70/21+20/36 70/21+60/18 70/63+20/18 70/21+20/54 70/21+20/90