Vocabulary
Factors & Multiples
Greatest Common Factor
Least Common Multiple
Word Problems
100

A prime factor has exactly this many factors.

2

100

List all the factors of 32.

1, 2, 4, 8, 16, 32

100

What is the greatest common factor of 12 and 15

3

100
What is the least common multiple of 3 and 7?
21
100
Timer 1 is set to beep every 8 minutes. Timer 2 is set to beep every 6 minutes. How many times will they beep at the same time in 30 minutes?
1
200

Define composite number.

A number with more than 2 factors.

200

List all common factors of 18 and 30.

1, 2, 3, 6

200
What is the greatest common factor of 24 and 20?
4
200
What is the least common multiple of 4 and 9?
36
200
You bring snacks for your basketball team every fifth game. Every third game is a home game. When will be the first time that you bring snacks to a home game?
15th game
300

This is the math symbol used to show groups.

parenthesis

300
List all the common multiples of 6 and 8 that are less than 50.
24 and 48
300

What is the greatest common factor of 16 and 36?

4

300

What is the least common multiple of 15 and 80?

240

300
Sarah is making bead necklaces. She has 60 blue beads and 72 green beads. What is the greatest number of identical necklaces she can make if she wants to use all the beads?
6
400

If you are asked to find the "prime factorization" of a composite number, what is the first step?

Make a factor tree

400

Determine the prime factorization of 42.

2x3x7

400

What is the great common factor of 50, 35, and 15?

5

400
What is the least common multiple of 20 and 12?
60
400
Three pigs entered a race around a track. Piggly takes 12 minutes to run one lap. Piglet takes 6 minutes to run one lap and it takes Wiggly 16 minutes to run one lap. If all three pigs begin the race at the same time, how many minutes will it take for all three pigs to be at the starting point again?
48 minutes
500

If 2 numbers are relatively prime, what factor do they have in common?

1

500

Write the following sum in the form a(b+c) where b and c have no common factors.

               20 + 44

4(5 +11)

500

Which of the following pairs of numbers are RELATIVELY PRIME? There may be more than one answer.

a).     3 and 12

b).     6 and 7

c).     5 and 25

d).    5 and 21

b and d

500
What is the least common multiple of 21 and 24?
168
500
Johnny baked 36 oatmeal cookies and 48 chocolate chip cookies to package in plastic containers for his teacher friends at school. He wants to divide the cookies into identical containers so that each container has the same number of each kind of cookie. If he wants each container to have the greatest number of cookies possible, how many plastic containers does he need?
12 plastic containers
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