Factors
Greatest Common Factors
Prime and Composite Numbers
Divisibility Tricks
Random Word Problems
100
Which number is a factor of 24? 12, 9, 5, 7
12
100

Find the common factors of 2 and 4.

2

100
Identify the following number as prime or composite. 45
45 is a composite number.
100

What is the trick for dividing by 10?

The  number must end in 0.

100
Create an expression that will help you to solve this problem. Sandra's turtle is four times as long as her pet beetle. If Sandra's turtle is 12 centimeters long, how long is her pet beetle?
Sandra's pet beetle is 3 centimeters long.
200
Which number is NOT a factor of 30? 5, 1, 8, 6
8
200
GCF of 15 and 20.

5

200
Identify the following number as prime or composite. 23
23 is a prime number.
200

What is the trick for dividing by 5?

The number must end in 0 or 5.

200
It costs $2 for a small box of crayons at the store. It costs $10 for a large pack of markers at the store. How many times more do the packs of markers cost than the box of crayons? Choose the expression that will solve the problem. A) 2 x 10 = M B) 2M = 10 C) 2 + M = 10 D) 10M = 20
B) 2M = 10
300
Which number is a factor of 10? 20, 12, 5, 3
5
300

GCF of 12 and 36

12

300
Identify the following number as prime or composite. 13
13 is a prime number.
300

What is the trick for dividing by 2?

It must end in an even number. (0, 2, 4, 6, 8)

300
Solve the problem. In a fourth grade classroom, there were 124 books at the beginning of the year in the classroom library. In September, 26 were checked out, but only 14 were returned at the end of the month. How many books are still in the classroom library at the end of the month?
112 books were in the classroom library at the end of the month.
400
Which number is NOT a factor of 36? 12, 6, 4, 8
8
400

GCF of 51 and 27.

3

400

Identify the following number as prime or composite. 57

57 is a composite number.

400

What is the trick for dividing by 4?

The last two digits must make a number that is divisible by 4.

400
Johnny made 37 cookies for his birthday party. His little brother ate 8 cookies before the birthday party even started. Johnny's mom made 20 more cookies to make Johnny stop crying. How many cookies did Johnny have when his birthday party began?
He had 49 cookies when his birthday party began.
500
List ALL of the factors of 24.
1, 2, 3, 4, 6, 8, 12, 24
500

GCF of 26 and 52

13

500
Identify the following number as prime or composite. 33
33 is a composite number.
500

What is the trick for dividing by 6?

The number must be divisible by 3 AND 2. (all digits add up to equal a number divisible by 3 AND ends in an even number).

500
Howard decided to take all of his blocks and build a tall tower in his bedroom. He started with 30 blocks. While building, he found 28 more blocks under his bed. He put these blocks on top of the original blocks and continued to build his tower. His dog came in and knocked down 14 of the blocks on his tower. How many blocks remained standing?
44 blocks remained standing.
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