Question

1. Indicate whether the number is divisible by 2, by 3, or by 5.(Note: Some numbers may be divisible by more than one of these numbers.)

a. 450
b. 31
c. 18,652
d. 455

2. Write out the prime factor of the following numbers.
a. 15
b. 21
c. 38
d. 42

3. What’s the least common multiple of each group of numbers?
a. 5 and 6
b. 2 and 9
c. 6 and 8
d. 2, 5, and 6

Answer 1

Explanation:

1 Identify the prime numbers in the following lists.

a. 5, 7, 12, 11=5,7,11

b. 14, 6, 3=3

c. 31, 17, 9, 15=31,17

d. 782, 61, 2=61, 2

2. Indicate whether the number is divisible by 2, by 3, or by 5.(Note: Some numbers may be divisible by more than one of these numbers.)

a. 450=2,3,5

b. 31=none

c. 18,652=2

d. 455=5

3. Write out the prime factor of the following numbers.

a. 15=3,5

b. 21=3,7,

c. 38=2,19

d. 42=2,3,7

Answer 2

1.

a.2,3,5 450/2=225 450/3=150 450/5=90

b.none

c.2 only 18,652/2=9,326

d.5 only 455/5=91

2.

a.3 and 5

b.3 and 7

c.19

d.7 and 21

3.

a.30

b.18

c.24

d.30