Add 45/21 and 75/5
1st number: 2 3/21, 2nd number: 15 0/5
45/21 + 75/5 is 120/7.
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,
45/21 = 45 × 5/21 × 5 = 225/105 - Likewise, for the 2nd fraction, since 5 × 21 = 105,
75/5 = 75 × 21/5 × 21 = 1575/105 - Add the two like fractions:
225/105 + 1575/105 = 225 + 1575/105 = 1800/105 - 1800/105 simplified gives 120/7
- So, 45/21 + 75/5 = 120/7
In mixed form: 171/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/21+75/5 45/42+75/5 45/21+75/10 45/63+75/5 45/21+75/15 45/21+75/25 45/21+75/35