Add 45/30 and 21/42
1st number: 1 15/30, 2nd number: 21/42
45/30 + 21/42 is 2/1.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 42 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 30 × 7 = 210,
45/30 = 45 × 7/30 × 7 = 315/210 - Likewise, for the 2nd fraction, since 42 × 5 = 210,
21/42 = 21 × 5/42 × 5 = 105/210 - Add the two like fractions:
315/210 + 105/210 = 315 + 105/210 = 420/210 - 420/210 simplified gives 2/1
- So, 45/30 + 21/42 = 2/1
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/30+21/42 45/60+21/42 45/30+21/84 45/30+63/42 45/90+21/42