Add 20/21 and 70/25
1st number: 20/21, 2nd number: 2 20/25
20/21 + 70/25 is 394/105.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 25 is 525
Next, find the equivalent fraction of both fractional numbers with denominator 525 - For the 1st fraction, since 21 × 25 = 525,
20/21 = 20 × 25/21 × 25 = 500/525 - Likewise, for the 2nd fraction, since 25 × 21 = 525,
70/25 = 70 × 21/25 × 21 = 1470/525 - Add the two like fractions:
500/525 + 1470/525 = 500 + 1470/525 = 1970/525 - 1970/525 simplified gives 394/105
- So, 20/21 + 70/25 = 394/105
In mixed form: 379/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/21+70/25 20/42+70/25 20/21+70/50 60/21+70/25 20/63+70/25 20/21+70/75