Add 45/8 and 70/21
1st number: 5 5/8, 2nd number: 3 7/21
45/8 + 70/21 is 215/24.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 21 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 8 × 21 = 168,
45/8 = 45 × 21/8 × 21 = 945/168 - Likewise, for the 2nd fraction, since 21 × 8 = 168,
70/21 = 70 × 8/21 × 8 = 560/168 - Add the two like fractions:
945/168 + 560/168 = 945 + 560/168 = 1505/168 - 1505/168 simplified gives 215/24
- So, 45/8 + 70/21 = 215/24
In mixed form: 823/24
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/8+70/21 45/16+70/21 45/8+70/42 45/24+70/21 45/8+70/63 45/40+70/21 45/56+70/21