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Factors
Multiples
Prime and Composite Numbers
Divisibility Rules
Factors II
100
Which number is not a factor of 24? 12, 9, 6, 4
9
100
Find the first 10 multiples of 6.
6, 12, 18, 24, 30, 36, 42, 48, 54, 60
100
Identify the following number as prime or composite. Explain your thinking. 45
45 is a composite number. 9x5
100
How can you determine if a number is divisible by 3? Show your thinking.
add all digits; if the sum of the digits are divisible by three, the number is divisible by three. 33 -> 3+3=6; 6 is divisible by three, therefore 33 is divisible by three. 34 -> 3+4=7; 7 is NOT divisible by three, therefore 34 is not divisible by three.
100
List all the factors of 12
1, 2, 3, 4, 6, 12
200
Which number is NOT a factor of 30? 5, 1, 8, 6
8
200
Find the first 10 multiples of 5. Find the first 10 multiples of 3. What is the Least Common Multiple that both 3 and 5 share?
Multiples of 5: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50 Multiples of 3: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30 Least Common Multiple: 15
200
Identify the following number as prime or composite. 23
23 is a prime number.
200
What is the divisibility rule for 5? Show your thinking.
The number must have a 5 or a 0 in the ones place.
200
List all the factors of 24
1, 2, 3, 4, 6, 8, 12, 24.
300
Which number is not a factor of 100? 20, 12, 5, 25
12
300
Which is a list of multiples of 9? A) 9, 18, 28, 39 B) 9, 18, 27, 36 C) 9, 18, 25, 32 D) 9, 27, 34, 48
B) 9, 18, 27, 36
300
Identify the following number as prime or composite. 13
13 is a prime number. 13 only has one set of factors; 1x13
300
Explain the divisibility rule for 6. Show your mathematical thinking.
The number must be divisible by both 2 and 3 in order to be divisible buy 6. 30 works; 2x15, 3x10, 6x5 33 does not work; 3x11, not divisible by 2; therefore not divisible by 6.
300
List all the factors of 25.
1, 5, 25.
400
Which number is NOT a factor of 36? 12, 6, 4, 8
8
400
Find the first 10 multiples of 4. Find the first 10 multiples of 7. What is the Least Common Multiple that both 4 and 7 share?
Multiples of 4: 4, 8, 12, 16, 20, 24, 28, 32, 36, 40 Multiples of 7: 7, 14, 21, 28, 35, 42, 49, 56, 63, 70 Least Common Multiple: 28
400
Identify the following number as prime or composite. Explain your thinking. 28
28 is a composite number. 14x2
400
What is the divisibility rule of 9?
The digits of the number must add up to nine in order to be divisible by 9. 72 -> 7+2=9; 9 divided by 9 = 1 81 -> 8+1=9; 9 divided by 9 = 1 19 -> 1+9=10; 9 does not fit into 10 equally.
400
List all the factors of 50
1, 2, 5, 10, 25, 50.
500
List ALL of the factors of 24.
1, 2, 3, 4, 6, 8, 12, 24
500
Which is a list of multiples of 8? A) 16, 24, 32, 42 B) 8, 16, 26, 32 C) 16, 24, 32, 40 D) 8, 16, 32, 46
C) 16, 24, 32, 40
500
Identify the following number as prime or composite. Explain your thinking. 33
33 is a composite number.
500
List the factors of 18. Use divisibility rules to help you.
1, 2, 3, 6, 9, 18.
500
List all the factors of 100
1, 2, 4, 5, 10, 20, 25, 50, 100.