Add 45/4 and 81/7
1st number: 11 1/4, 2nd number: 11 4/7
45/4 + 81/7 is 639/28.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 7 is 28
Next, find the equivalent fraction of both fractional numbers with denominator 28 - For the 1st fraction, since 4 × 7 = 28,
45/4 = 45 × 7/4 × 7 = 315/28 - Likewise, for the 2nd fraction, since 7 × 4 = 28,
81/7 = 81 × 4/7 × 4 = 324/28 - Add the two like fractions:
315/28 + 324/28 = 315 + 324/28 = 639/28 - So, 45/4 + 81/7 = 639/28
In mixed form: 2223/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/4+81/7 45/8+81/7 45/4+81/14 45/12+81/7 45/4+81/21 45/20+81/7 45/4+81/35 45/28+81/7 45/4+81/49