Add 45/30 and 3/21
1st number: 1 15/30, 2nd number: 3/21
45/30 + 3/21 is 23/14.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 21 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 30 × 7 = 210,
45/30 = 45 × 7/30 × 7 = 315/210 - Likewise, for the 2nd fraction, since 21 × 10 = 210,
3/21 = 3 × 10/21 × 10 = 30/210 - Add the two like fractions:
315/210 + 30/210 = 315 + 30/210 = 345/210 - 345/210 simplified gives 23/14
- So, 45/30 + 3/21 = 23/14
In mixed form: 19/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/30+3/21 45/30+6/21 45/60+3/21 45/30+3/42 45/30+9/21 45/90+3/21 45/30+3/63 45/30+15/21