Add 70/20 and 98/21
1st number: 3 10/20, 2nd number: 4 14/21
70/20 + 98/21 is 49/6.
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,
70/20 = 70 × 21/20 × 21 = 1470/420 - Likewise, for the 2nd fraction, since 21 × 20 = 420,
98/21 = 98 × 20/21 × 20 = 1960/420 - Add the two like fractions:
1470/420 + 1960/420 = 1470 + 1960/420 = 3430/420 - 3430/420 simplified gives 49/6
- So, 70/20 + 98/21 = 49/6
In mixed form: 81/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/40+98/21 70/20+98/42 70/60+98/21 70/20+98/63