Add 20/5 and 10/21
1st number: 4 0/5, 2nd number: 10/21
20/5 + 10/21 is 94/21.
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,
20/5 = 20 × 21/5 × 21 = 420/105 - Likewise, for the 2nd fraction, since 21 × 5 = 105,
10/21 = 10 × 5/21 × 5 = 50/105 - Add the two like fractions:
420/105 + 50/105 = 420 + 50/105 = 470/105 - 470/105 simplified gives 94/21
- So, 20/5 + 10/21 = 94/21
In mixed form: 410/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/5+10/21 20/5+20/21 20/10+10/21 20/5+10/42 60/5+10/21 20/5+30/21 20/15+10/21 20/5+10/63 20/5+50/21 20/25+10/21 20/5+70/21 20/35+10/21