Multiples and factors (prime factorization)

Advanced Math 5 · Unit 3 · prime-factorization-gcf-lcm

prime-factorization-gcf-lcm

Name ______________________________Date ______________

1.
Write $72$ as a product of primes in index notation. What is the exponent of $2$ ?
Answer: ______________
2.
Using $24 = 2^3 \cdot 3$ and $90 = 2 \cdot 3^2 \cdot 5$ , find $\text{LCM}(24, 90)$ .
Answer: ______________
3.
A red light flashes every $8$ seconds and a blue light flashes every $12$ seconds. They flash together now. In how many seconds will they next flash together?
1. (A)
  $4$
2. (B)
  $48$
3. (C)
  $96$
4. (D)
  $24$