Prime vs. Composite
Divisibility
Common Factors
Division
Random
100
19
Prime
100
Is 18 divisible by 9?
Yes, because 18/9 is 2.
100
What are the common factors of 9 and 12?
9 12
1X 9 12 X 1
3 X 3 3 X 4
6 X 2
Common Factors = 1 and 3
100
10 5
2
100
Without counting, How many students are in this math class?
8 students
200
24
Composite
200
Is 40 divisible by 6?
No 40 is not divisible by 6.
6 X ____ does not equal 40.
6 X6 =36
6 X 7 = 42
200
What are the common factors of 14 and 21
14: 1 X 14, 2 X 7
21: 21 X 1, 7 X 3
Common Factors: 1 and 3
200
48 8
6
200
What are the colors of the rainbow?
Red, Orange, Yellow, Green, Blue and Violet
300
48
Composite
300
Is 36 divisible by 5? Why?
No because the multiples of 5 are only "0" and "5"
300
Common Factors of 24 and 36
24
1 X 24, 2 X12, 3 X 8, 4 X 6,
36
1X 36, 2 X 15, 3 X 12, 4 X9, 6 X 6
Common Factors: 1,2, 3, 4, 6, 12
300
567
8
300
What is the acronym used for long division?
DMSB
"Does McDonalds sell burgers?"
400
31
Prime
400
Is 52 divisible by 2? Why
Yes, because 52 ends in an even number.
26 x 2 = 52
400
Find the common factors of 45 and 81
45: 1 X 45, 3 X 15, 9 X 5
81: 1 X 81, 9 X9
Common factors = 1,9
400
819
9
400
72 8
9
500
125
Composite
500
Is 26, 784 divisible by 2?
YES, because it ends in a EVEN number.
Answer: 13,392
500
What are the common factors of 10 and 100
10: 1 X 10, 2 X 5
100: 1 X100, 2 X 50, 4 X 25, 5 X 20, 10 X 10
Common factors: 1,2,5,10
500
42 divided by 2 using DMSB
21
500
What is Miss Genevieves favorite color?
Yellow