Add 20/75 and 8/21
20/75 + 8/21 is 68/105.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 75 and 21 is 525
Next, find the equivalent fraction of both fractional numbers with denominator 525 - For the 1st fraction, since 75 × 7 = 525,
20/75 = 20 × 7/75 × 7 = 140/525 - Likewise, for the 2nd fraction, since 21 × 25 = 525,
8/21 = 8 × 25/21 × 25 = 200/525 - Add the two like fractions:
140/525 + 200/525 = 140 + 200/525 = 340/525 - 340/525 simplified gives 68/105
- So, 20/75 + 8/21 = 68/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/75+8/21 20/75+16/21 20/75+8/42 60/75+8/21 20/75+24/21 20/75+8/63 20/75+40/21 20/75+56/21