Add 45/30 and 90/21
1st number: 1 15/30, 2nd number: 4 6/21
45/30 + 90/21 is 81/14.
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,
90/21 = 90 × 10/21 × 10 = 900/210 - Add the two like fractions:
315/210 + 900/210 = 315 + 900/210 = 1215/210 - 1215/210 simplified gives 81/14
- So, 45/30 + 90/21 = 81/14
In mixed form: 511/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/30+90/21 45/60+90/21 45/30+90/42 45/90+90/21 45/30+90/63