Prime and Composite
What is a prime number?
A number that is only divisible by 1 and itself and/or a number that's only factors are 1 and itself
What is the mnemonic device (or saying to help us to remember the order) for PEMDAS?
Please Excuse My Dear Aunt Sally
Name one signal word or phrase for division.
Any of the following: shared equally, quotient, how many in each group, how many will each receive
What does factor mean?
The numbers that make-up a number
What is place value of the underlined digit?
789873.876
thousandths
What is a composite number?
A number that has 3 or more factors and/or a number that is divisible by 3 or more numbers
What does each letter in PEMDAS stand for? (Hint: P stands for parenthesis)
Parenthesis, Exponents, Multiplication, Division, Addition, Subtraction
5X6
What are the factors for 32?
1, 2, 4, 8, 16, 32
What digits would make a number round up? (Hint: "Raise the Score" "Roller coaster" and "Can this digit go to Kindergarten" are all things to help us remember.)
5 or more (5, 6, 7, 8, 9)
Is 1 a prime or composite number? Why?
1 is not prime or composite because is one and only (Optimus Prime)
What would be the first step in this equation?
5+6X6-2
6X6
Write the equation for: The difference of 43 and 18
43-18
Is 432 divisible by 3? (Hint: Think about the Divisibility Rules)
Yes, because 4+3+2=9 and 9 is divisible by 3, so 432 is therefore divisible by 3.
What is the value of the following number rounded to the nearest hundreds?
456, 679.28
456, 700.00
Is 55 prime or composite?
Composite
1, 5, 11, 55
Solve this equation.
[(5+4)X(16-5)]+32
131
Write the equation for: The sum of 15 and 7 minus 13
15+7-13
What are the factors for 73?
1, 73
What is the value of the following number rounded to the nearest hundredths?
627.834
627.83
STAAR Question: Brenda said that the number 2 is prime because it has only two factors. Carla said that the number 2 is composite because it is even, and all even numbers are composite. Who is correct?
A Brenda is correct.
B Carla is correct.
C Both of them are correct.
D Neither of them is correct.
A Brenda is correct.
Ms. LaRue is trying something new. She is labeling all books with a numerical expression. Lisa needs to find a book that has the value of 15. Which book should she choose?
A 15-8X2
B 34+6-25
C 53X2-25
B 34+6-25
Margaret opened a new case of lightbulbs.
• The case contained 3 boxes of lightbulbs with 8 lightbulbs in each box.
• Margaret threw 2 of these lightbulbs in the trash because they were damaged.
• Then she took 7 of the lightbulbs out of the case.
Which expression can be used to show that there are 15 lightbulbs still in the case?
F 3 × 8 − 2 + 7
G 3(8) − 2(7)
H 3 × 8 − (2 + 7)
J 3 + 8 − 2 + 7
H 3 × 8 − (2 + 7)
Chelsea said that if 2 and 4 are factors of a number, then 8 is a factor of the number. Is she correct?
No, 2 and 4 are factors of 20, but 8 is not a factor.
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