Add 70/45 and 4/21
1st number: 1 25/45, 2nd number: 4/21
70/45 + 4/21 is 110/63.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 21 is 315
Next, find the equivalent fraction of both fractional numbers with denominator 315 - For the 1st fraction, since 45 × 7 = 315,
70/45 = 70 × 7/45 × 7 = 490/315 - Likewise, for the 2nd fraction, since 21 × 15 = 315,
4/21 = 4 × 15/21 × 15 = 60/315 - Add the two like fractions:
490/315 + 60/315 = 490 + 60/315 = 550/315 - 550/315 simplified gives 110/63
- So, 70/45 + 4/21 = 110/63
In mixed form: 147/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/45+8/21 70/90+4/21 70/45+4/42 70/45+12/21 70/45+4/63 70/45+20/21 70/45+28/21