Add 50/20 and 70/21
1st number: 2 10/20, 2nd number: 3 7/21
50/20 + 70/21 is 35/6.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 21 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 20 × 21 = 420,
50/20 = 50 × 21/20 × 21 = 1050/420 - Likewise, for the 2nd fraction, since 21 × 20 = 420,
70/21 = 70 × 20/21 × 20 = 1400/420 - Add the two like fractions:
1050/420 + 1400/420 = 1050 + 1400/420 = 2450/420 - 2450/420 simplified gives 35/6
- So, 50/20 + 70/21 = 35/6
In mixed form: 55/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 50/40+70/21 50/20+70/42 50/60+70/21 50/20+70/63