Add 21/7 and 45/9
1st number: 3 0/7, 2nd number: 5 0/9
21/7 + 45/9 is 8/1.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 9 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 7 × 9 = 63,
21/7 = 21 × 9/7 × 9 = 189/63 - Likewise, for the 2nd fraction, since 9 × 7 = 63,
45/9 = 45 × 7/9 × 7 = 315/63 - Add the two like fractions:
189/63 + 315/63 = 189 + 315/63 = 504/63 - 504/63 simplified gives 8/1
- So, 21/7 + 45/9 = 8/1
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/7+45/9 21/7+90/9 21/14+45/9 21/7+45/18 63/7+45/9 21/7+45/27 21/35+45/9 21/49+45/9 21/7+45/63