Add 12/70 and 30/90
12/70 + 30/90 is 53/105.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 90 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 70 × 9 = 630,
12/70 = 12 × 9/70 × 9 = 108/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
30/90 = 30 × 7/90 × 7 = 210/630 - Add the two like fractions:
108/630 + 210/630 = 108 + 210/630 = 318/630 - 318/630 simplified gives 53/105
- So, 12/70 + 30/90 = 53/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/70+30/90 12/70+60/90 36/70+30/90 60/70+30/90 84/70+30/90