Prime and Composite
True or False:
One is a prime number
False-- But one is special, it's neither true or false
Evaluate 2 to the 4th power
2 x 2 x 2 x 2 = 16
Find the Greatest common factor of 12, 24
2
Find the LCM of 9,12
36
Pencils come in packages of 10. Erasers come in packages of 12. Phillip wants to purchase the smallest number of pencils and erasers so that he will have exactly 1 eraser per pencil. How many packages of pencils and erasers should Phillip buy?
60
2,3,5,7,11,13
What are the factors of 36
1 x 36
2 x 18
3 x 12
4 x 9
6 x 6
Find the GCF of 9 and 27
9
Which is not a common multiple of 4 and 6:
8
12
24
60
8
Kiara baked 30 oatmeal cookies and 48 chocolate chip cookies to package in plastic containers for her friends at school. She wants to divide the cookies into identical containers so that each container has the same number of each kind of cookie. If she wants each container to have the greatest number of cookies possible, how many plastic containers does she need?
6
is 91 a prime number
No- 7 x 13
Find the prime factorization of 48
2 x 2 x 2 x 3
Find the GCF of 13 and 21
LCM of 5,9
Boxes that are 12 inches tall are being stacked next to boxes that are 18 inches tall. What is the shortest height at which the two stacks will be the same height?
36
What is the divisibility rule of 4?
The last two number are divisible by 4:
Example 1040- 40 is the last two numbers and if you divide that by 4 you get 10
Find the prime factorization of 19
19
Find the GCF of 28 and 42
14
LCM of 8, 12, 36
Beginning at 8:30 A.M., tours of the National Capitol and the White House begin at a tour agency. Tours for the National Capitol leave every 15 minutes. Tours for the White House leave every 20 minutes. How often do the tours leave at the same time?
60
1125 divisible by 2? 3? 4? 5? 6? 9? 10?
Yes: 3, 5, 9, 10
Find the prime factorization of 45. Use Exponents if possible
3^2 x 5
Find the GCF of 24, 56, 64
8
LCM of 4, 6, 8
36
Two neon lights are turned on at the same time. One blinks every 4 seconds and the other blinks every 6 seconds. In 60 seconds, how many times will they blink at the same time?
24