Add 18/90 and 12/70
18/90 + 12/70 is 13/35.
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,
18/90 = 18 × 7/90 × 7 = 126/630 - Likewise, for the 2nd fraction, since 70 × 9 = 630,
12/70 = 12 × 9/70 × 9 = 108/630 - Add the two like fractions:
126/630 + 108/630 = 126 + 108/630 = 234/630 - 234/630 simplified gives 13/35
- So, 18/90 + 12/70 = 13/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/90+12/70 18/90+24/70 54/90+12/70 18/90+36/70 18/90+60/70 18/90+84/70