Add 54/30 and 84/21
1st number: 1 24/30, 2nd number: 4 0/21
54/30 + 84/21 is 29/5.
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,
54/30 = 54 × 7/30 × 7 = 378/210 - Likewise, for the 2nd fraction, since 21 × 10 = 210,
84/21 = 84 × 10/21 × 10 = 840/210 - Add the two like fractions:
378/210 + 840/210 = 378 + 840/210 = 1218/210 - 1218/210 simplified gives 29/5
- So, 54/30 + 84/21 = 29/5
In mixed form: 54/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/60+84/21 54/30+84/42 54/90+84/21 54/30+84/63