Add 70/21 and 5/20
1st number: 3 7/21, 2nd number: 5/20
70/21 + 5/20 is 43/12.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 20 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 21 × 20 = 420,
70/21 = 70 × 20/21 × 20 = 1400/420 - Likewise, for the 2nd fraction, since 20 × 21 = 420,
5/20 = 5 × 21/20 × 21 = 105/420 - Add the two like fractions:
1400/420 + 105/420 = 1400 + 105/420 = 1505/420 - 1505/420 simplified gives 43/12
- So, 70/21 + 5/20 = 43/12
In mixed form: 37/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/21+10/20 70/42+5/20 70/21+5/40 70/21+15/20 70/63+5/20 70/21+5/60 70/21+25/20 70/21+35/20