Prime and Composite
What is a prime number? Give an example.
A number that only has 2 factors, one and itself. (2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97)
Use prime factorization for 18.
2 x 32 or (2 x 3 x 3)
Simplify 6/9
2/3
Write 8/3 as a mixed number.
2 2/3
What makes a number divisible by 2?
It is an even Number and the Ones Digit is a 0,2,4,6, or 8
Neither
Use prime factorization for 30.
2 x 3 x 5
Simplify 7/21
1/3
Write 15/4 as a mixed number
3 3/4
Is 729 divisible by 3?
Yes! Due to the divisibility rule for the number 3 that states: If the sum of the digits is divisible by 3, so is the number itself! 7+2+9 = 18 and 18 is divisible by 3!
What is a composite number? Give an example.
A number with more than two factors
Use prime factorization for 60.
22 x 3 x 5 or (2 x 2 x 3 x 5)
Which fraction is equivalent to 1/2
A. 10/19 B. 10/17 C. 10/11 D. 10/20
D.
10/20
Write 3 7/8 as an improper fraction.
31/8
What is the divisibility rule for the number 6?
If the number is divisible by 2 and 3 the number is divisible by 6!
prime
Use prime factorization for 81.
34 or (3 x 3 x 3 x 3)
3/12 = n/4
n = 1
Write 20/5 as a mixed number.
4
48 is divisible by what numbers? List them!
1,2,3,4,6,8,12,16,24,48
Is 4 a prime or a composite number?
Composite
Use prime factorization for 108.
22 x 33 or (2 x 2 x 3 x 3 x 3)
Simplify
13/21
13/21
A recipe calls for 3 2/5 cups of flour. You only have an improper fraction measuring cup. What is 3 2/5 as an improper fraction?
Then, if you accidentally measure 17/4 cups of sugar, what is 17/4 as a mixed number?
The improper fraction is
17/5
4 1/4
What are the numbers between 2-10 that 35,496 is divisible by ...
2,3,4,6,9