Divisibility Rules
This number divides evenly into all even numbers.
2
A number that has exactly two factors; one and itself.
A prime number
Two or more numbers that are multiplied together to create a product.
Factors
The GCF of 36 and 48.
12
What is the prime factorization of 60?
2x2x3x5
What is the LCM for 7 and 9.
63
This number divides evenly into all numbers that end with 5 and 0.
5
This number is the only even prime number.
2
List all the factors of the number 24.
1, 2, 3, 4, 6, 8, 12, and 24
The GCF between 30 and 25.
5
What is the prime factorization of 20?
2x2x5
What is the LCM for 12 and 15
60
You do this to a number to decide if the number is divisible by the number 3.
Find the sum of the digits.
List the first 5 prime numbers.
2, 3, 5, 7, and 11
List all the factors of the number 25.
1, 5, and 25
Paul has 16 fish pictures and 12 deer pictures to display. He wants to arrange the pictures in rows with the same numbers of fish and of deer pictures in each row. What is the largest row Paul can make?
4 rows
What is the prime factorization of 72?
2x2x2x3x3
You buy a lily and an African violet on the same day. You are instructed to water the lily every fourth day and water the violet every seventh day after taking them home. What is the first day on which you will water both plants on the same day?
28th Day
These are the two numbers that both need to evenly divide into a number to make the number also divisible by 6.
2 and 3
This number is the only whole number that is neither prime, nor composite.
1
List all the factors for the number 13.
1 and13
The middle school band has 56 members. The high school band has 96 members. The bands are going to march one after the other in a parade. The director wants to arrange the bands into the same number of columns. What is the greatest number of columns in which the two bands can be arranged if each column has the same number of marchers?
8 columns
Molly does ten sit-ups every 3 hours and fifteen push-ups every 2 hours. She does 10 sit-ups and 15 push-ups at 8am. At what time will she do both?
Every 6 hours she will do both, so 2 PM
List all factors less than 12 that divide equally into 342.
1, 2, 3, 6, and 9
If a number is greater than 10 and divisible by 5, would it be prime or composite?
A composite number
List the factors of 30.
1, 2, 3, 5, 6, 10, 15, and 30
Megan has 30 brownies and 42 cupcakes to package. She wants to put the same numbers of brownies and of cupcakes in each box. What is the greatest number of boxes she can make? How many cupcakes and how many brownies will each box contain?
6 boxes
each box will have 5 brownies and 7 cupcakes.
What is the prime factorization of 99?
3x3x11
Hotdogs are sold in packages of 6. Buns are sold in packages of 8. What is the least number of hotdogs and buns that should be bought to have an equal amount of each?
24