Add 70/90 and 72/84
70/90 + 72/84 is 103/63.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 84 is 1260
Next, find the equivalent fraction of both fractional numbers with denominator 1260 - For the 1st fraction, since 90 × 14 = 1260,
70/90 = 70 × 14/90 × 14 = 980/1260 - Likewise, for the 2nd fraction, since 84 × 15 = 1260,
72/84 = 72 × 15/84 × 15 = 1080/1260 - Add the two like fractions:
980/1260 + 1080/1260 = 980 + 1080/1260 = 2060/1260 - 2060/1260 simplified gives 103/63
- So, 70/90 + 72/84 = 103/63
In mixed form: 140/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: