Question

how to find the LCD of 12, 9, 60, and 45?

Answer 1

multiply them all

Answer 2

you meant LCM=least common multiple...then it would be 3

Answer 3

no, LCD

Answer 4

LCm and LCD are different......from what i saw when i googled it

Answer 5

but you don't have any denominators in the given information

Answer 6

12 = 2^2×3 (3 prime factors, 2 distinct)
9 = 3^2 (2 prime factors, 1 distinct)
60 = 2^2×3×5 (4 prime factors, 3 distinct)
45 = 3^2×5 (3 prime factors, 2 distinct)

LCM = get all unique prime factors, multiply their highest powers:
LCM = 2^2 * 3^2 * 5
= 180

LCD is the LCM for denominators for rational numbers (e.g. fractions)

Ans. 180