Add 45/5 and 20/21
1st number: 9 0/5, 2nd number: 20/21
45/5 + 20/21 is 209/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 21 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 5 × 21 = 105,
45/5 = 45 × 21/5 × 21 = 945/105 - Likewise, for the 2nd fraction, since 21 × 5 = 105,
20/21 = 20 × 5/21 × 5 = 100/105 - Add the two like fractions:
945/105 + 100/105 = 945 + 100/105 = 1045/105 - 1045/105 simplified gives 209/21
- So, 45/5 + 20/21 = 209/21
In mixed form: 920/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/5+20/21 45/5+40/21 45/10+20/21 45/5+20/42 45/5+60/21 45/15+20/21 45/5+20/63 45/25+20/21 45/35+20/21