Add 18/21 and 5/70
18/21 + 5/70 is 13/14.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 70 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 21 × 10 = 210,
18/21 = 18 × 10/21 × 10 = 180/210 - Likewise, for the 2nd fraction, since 70 × 3 = 210,
5/70 = 5 × 3/70 × 3 = 15/210 - Add the two like fractions:
180/210 + 15/210 = 180 + 15/210 = 195/210 - 195/210 simplified gives 13/14
- So, 18/21 + 5/70 = 13/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/21+5/70 18/21+10/70 18/42+5/70 54/21+5/70 18/21+15/70 18/63+5/70 90/21+5/70 18/21+25/70 18/21+35/70