Add 84/21 and 20/5
1st number: 4 0/21, 2nd number: 4 0/5
84/21 + 20/5 is 8/1.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 5 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 21 × 5 = 105,
84/21 = 84 × 5/21 × 5 = 420/105 - Likewise, for the 2nd fraction, since 5 × 21 = 105,
20/5 = 20 × 21/5 × 21 = 420/105 - Add the two like fractions:
420/105 + 420/105 = 420 + 420/105 = 840/105 - 840/105 simplified gives 8/1
- So, 84/21 + 20/5 = 8/1
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/21+40/5 84/42+20/5 84/21+20/10 84/21+60/5 84/63+20/5 84/21+20/15 84/21+20/25 84/21+20/35