Add 21/45 and 8/7
1st number: 21/45, 2nd number: 1 1/7
21/45 + 8/7 is 169/105.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 7 is 315
Next, find the equivalent fraction of both fractional numbers with denominator 315 - For the 1st fraction, since 45 × 7 = 315,
21/45 = 21 × 7/45 × 7 = 147/315 - Likewise, for the 2nd fraction, since 7 × 45 = 315,
8/7 = 8 × 45/7 × 45 = 360/315 - Add the two like fractions:
147/315 + 360/315 = 147 + 360/315 = 507/315 - 507/315 simplified gives 169/105
- So, 21/45 + 8/7 = 169/105
In mixed form: 164/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/45+8/7 21/45+16/7 21/90+8/7 21/45+8/14 63/45+8/7 21/45+24/7 21/45+8/21 21/45+40/7 21/45+8/35 21/45+56/7 21/45+8/49