Add 25/20 and 70/84
1st number: 1 5/20, 2nd number: 70/84
25/20 + 70/84 is 25/12.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 84 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 20 × 21 = 420,
25/20 = 25 × 21/20 × 21 = 525/420 - Likewise, for the 2nd fraction, since 84 × 5 = 420,
70/84 = 70 × 5/84 × 5 = 350/420 - Add the two like fractions:
525/420 + 350/420 = 525 + 350/420 = 875/420 - 875/420 simplified gives 25/12
- So, 25/20 + 70/84 = 25/12
In mixed form: 21/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 50/20+70/84 25/40+70/84 75/20+70/84 25/60+70/84