Add 70/21 and 1/20
1st number: 3 7/21, 2nd number: 1/20
70/21 + 1/20 is 203/60.
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,
1/20 = 1 × 21/20 × 21 = 21/420 - Add the two like fractions:
1400/420 + 21/420 = 1400 + 21/420 = 1421/420 - 1421/420 simplified gives 203/60
- So, 70/21 + 1/20 = 203/60
In mixed form: 323/60
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/21+2/20 70/42+1/20 70/21+1/40 70/21+3/20 70/63+1/20 70/21+1/60 70/21+5/20 70/21+7/20