Add 21/18 and 25/70
1st number: 1 3/18, 2nd number: 25/70
21/18 + 25/70 is 32/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 70 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 18 × 35 = 630,
21/18 = 21 × 35/18 × 35 = 735/630 - Likewise, for the 2nd fraction, since 70 × 9 = 630,
25/70 = 25 × 9/70 × 9 = 225/630 - Add the two like fractions:
735/630 + 225/630 = 735 + 225/630 = 960/630 - 960/630 simplified gives 32/21
- So, 21/18 + 25/70 = 32/21
In mixed form: 111/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/18+25/70 21/18+50/70 21/36+25/70 63/18+25/70 21/18+75/70 21/54+25/70 21/90+25/70