Add 1/21 and 45/30
1st number: 1/21, 2nd number: 1 15/30
1/21 + 45/30 is 65/42.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 30 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 30 × 7 = 210,
45/30 = 45 × 7/30 × 7 = 315/210 - Add the two like fractions:
10/210 + 315/210 = 10 + 315/210 = 325/210 - 325/210 simplified gives 65/42
- So, 1/21 + 45/30 = 65/42
In mixed form: 123/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/21+45/30 1/21+90/30 1/42+45/30 1/21+45/60 3/21+45/30 1/63+45/30 1/21+45/90 5/21+45/30 7/21+45/30