Divisibility Rules
A number that has exactly two factors; one and itself.
What is a prime number.
What are numbers multiplied together to create a product.
factors.
What is the GCF of 36 and 48?
12
2x2x3x5
60
This number is the only even prime number.
What is 2.
How may factors are in 24? List the factors of the number 24.
What is 8 (1, 2, 3, 4, 6, 8, 12, 24)
Find the LCM for 12 and 15
What is 60.
The prime factorization of 20. Use exponents when needed.
What is 2x2x5? 2^2 x 5
These are the first 5 prime numbers.
What are 2, 3, 5, 7, 11.
List the factors of the number 25.
What is (1, 5, 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? (GCF)
4 rows
2x2x2x3x3
What is the prime factorization of 72?
This number is the only whole number that is neither prime, nor composite.
What is 1.
Use the distributive property to create a simple way to find a solution to this problem.
6 x 28 = 6 x ( ___ + ___ )
(6 x ___) + (6 x ___)
What is 6 x (20 + 8)
(6 x 20) + (6 x 8)
120 + 48
168
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 them both again? (HINT Find LCM)
Every 6 hours she will do both, so 2 PM
Which of these numbers (2,3,4,5,6,9,10) divide equally into 342.
What are 2, 3, 6, 9
A number that is greater than 10 and divisible by 5 be prime or composite.
What is composite.
use the distributive property to create a simple way to find the solution to this problem.
7 x 27 = ___ x ( ___ + ___ )
(7 x ___) + (7 x ___)
What is 7 x (20 + 7) ?
(7 x 20) + (7 x 7)
140 + 49
189
Hotdogs are sold in packages of 6. Buns are sold in packages of 8. What is the least number (LCM) of hotdogs and buns that should be bought to have an equal amount of each?
What is 24?
4 packages of hotdogs 4 x 6 = 24
3 packages of buns 3 x 8 = 24
3x3x11
What is the prime factorization of 99?