Add 1/21 and 25/70
1/21 + 25/70 is 17/42.
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,
1/21 = 1 × 10/21 × 10 = 10/210 - Likewise, for the 2nd fraction, since 70 × 3 = 210,
25/70 = 25 × 3/70 × 3 = 75/210 - Add the two like fractions:
10/210 + 75/210 = 10 + 75/210 = 85/210 - 85/210 simplified gives 17/42
- So, 1/21 + 25/70 = 17/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/21+25/70 1/21+50/70 1/42+25/70 3/21+25/70 1/21+75/70 1/63+25/70 5/21+25/70 7/21+25/70