Add 84/63 and 12/90
1st number: 1 21/63, 2nd number: 12/90
84/63 + 12/90 is 22/15.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 63 and 90 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 63 × 10 = 630,
84/63 = 84 × 10/63 × 10 = 840/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
12/90 = 12 × 7/90 × 7 = 84/630 - Add the two like fractions:
840/630 + 84/630 = 840 + 84/630 = 924/630 - 924/630 simplified gives 22/15
- So, 84/63 + 12/90 = 22/15
In mixed form: 17/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/63+24/90 84/63+36/90 84/63+60/90 84/63+84/90