Add 72/63 and 42/90
1st number: 1 9/63, 2nd number: 42/90
72/63 + 42/90 is 169/105.
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,
72/63 = 72 × 10/63 × 10 = 720/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
42/90 = 42 × 7/90 × 7 = 294/630 - Add the two like fractions:
720/630 + 294/630 = 720 + 294/630 = 1014/630 - 1014/630 simplified gives 169/105
- So, 72/63 + 42/90 = 169/105
In mixed form: 164/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/63+84/90