Add 70/42 and 80/45
1st number: 1 28/42, 2nd number: 1 35/45
70/42 + 80/45 is 31/9.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 45 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 42 × 15 = 630,
70/42 = 70 × 15/42 × 15 = 1050/630 - Likewise, for the 2nd fraction, since 45 × 14 = 630,
80/45 = 80 × 14/45 × 14 = 1120/630 - Add the two like fractions:
1050/630 + 1120/630 = 1050 + 1120/630 = 2170/630 - 2170/630 simplified gives 31/9
- So, 70/42 + 80/45 = 31/9
In mixed form: 34/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/84+80/45 70/42+80/90