Add 84/90 and 45/70
84/90 + 45/70 is 331/210.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 70 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 90 × 7 = 630,
84/90 = 84 × 7/90 × 7 = 588/630 - Likewise, for the 2nd fraction, since 70 × 9 = 630,
45/70 = 45 × 9/70 × 9 = 405/630 - Add the two like fractions:
588/630 + 405/630 = 588 + 405/630 = 993/630 - 993/630 simplified gives 331/210
- So, 84/90 + 45/70 = 331/210
In mixed form: 1121/210
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/90+90/70