Add 30/45 and 81/70
1st number: 30/45, 2nd number: 1 11/70
30/45 + 81/70 is 383/210.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 70 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 45 × 14 = 630,
30/45 = 30 × 14/45 × 14 = 420/630 - Likewise, for the 2nd fraction, since 70 × 9 = 630,
81/70 = 81 × 9/70 × 9 = 729/630 - Add the two like fractions:
420/630 + 729/630 = 420 + 729/630 = 1149/630 - 1149/630 simplified gives 383/210
- So, 30/45 + 81/70 = 383/210
In mixed form: 1173/210
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/45+81/70 30/90+81/70 90/45+81/70