Add 40/5 and 30/21
1st number: 8 0/5, 2nd number: 1 9/21
40/5 + 30/21 is 66/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 21 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 5 × 21 = 105,
40/5 = 40 × 21/5 × 21 = 840/105 - Likewise, for the 2nd fraction, since 21 × 5 = 105,
30/21 = 30 × 5/21 × 5 = 150/105 - Add the two like fractions:
840/105 + 150/105 = 840 + 150/105 = 990/105 - 990/105 simplified gives 66/7
- So, 40/5 + 30/21 = 66/7
In mixed form: 93/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/5+30/21 40/5+60/21 40/10+30/21 40/5+30/42 40/5+90/21 40/15+30/21 40/5+30/63 40/25+30/21 40/35+30/21