Add 15/45 and 40/70
15/45 + 40/70 is 19/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 70 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 45 × 14 = 630,
15/45 = 15 × 14/45 × 14 = 210/630 - Likewise, for the 2nd fraction, since 70 × 9 = 630,
40/70 = 40 × 9/70 × 9 = 360/630 - Add the two like fractions:
210/630 + 360/630 = 210 + 360/630 = 570/630 - 570/630 simplified gives 19/21
- So, 15/45 + 40/70 = 19/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/45+40/70 15/45+80/70 15/90+40/70 75/45+40/70