Add 45/75 and 1/21
45/75 + 1/21 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,
45/75 = 45 × 7/75 × 7 = 315/525 - Likewise, for the 2nd fraction, since 21 × 25 = 525,
1/21 = 1 × 25/21 × 25 = 25/525 - Add the two like fractions:
315/525 + 25/525 = 315 + 25/525 = 340/525 - 340/525 simplified gives 68/105
- So, 45/75 + 1/21 = 68/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/75+1/21 45/75+2/21 45/75+1/42 45/75+3/21 45/75+1/63 45/75+5/21 45/75+7/21