Example 7/30 + 11/42
Find the LCM of 30 and 42.
Factor them.
2 x 3 x 5 = 30
2 x 3 x 7 = 42
Combine the factors, eliminating duplicates.
2 x 3 x 5 x 7 = 210, the LCM
Convert the fractions to common denominators.
49/210 + 55/210 = 104/210 or 52/105
Chat with our AI personalities
The LCM refers to integers, not fractions.
The HCF helps when reducing fractions. The LCM helps when adding or subtracting fractions.
1/2=4/8=1/2
When adding fractions, you want to make sure that the denominators are the same. It's the same process as the LCM.
The HCF helps in simplifying fractions and the LCM helps in finding the lowest common denominator in fractions