Divisibility Rules
Factors
Prime & Composite
Prime Factorization
GCF
100
Is 243 divisible by 2? Why or why not?
No because it doesn't end in 0,2,4,6,8 (it is not even).
100

Give me two words that describe your math ability

Think positively - you CAN do math!!

100

What is your FAVORITE class???

Math of course!

100

What are the prime factors of 25? (Make a factor tree and write out your answer)

25=5x5

100
Find the GCF of 3 and 17.
GCF=1
200
Is 43,870 divisible by 5? Why or why not?
Yes because is ends in 0.
200
List all the factors of 19.
1,19
200
Is 37 prime or composite?
Prime
200

What are the prime factors of 41. (Make a factor tree and write out your answer)

41=1, 41

200
Find the GCF of 15 and 35.
15=3x5, 35=5x7, GCF=5
300
Is 10,405 divisible by 10? Why or why not?
No because it doesn't end with a 0.
300
List all the factors of 14.
1,2,7,14
300
Is 19 prime or composite?
Prime
300

What are the prime factors of 8? (Make a factor tree and write out your answer)

8=2x2x2

300
Find the GCF of 24 and 66.
24=2x2x2x3, 66=2x3x11, GCF=2x3=6
400

We only use the sum of the digits as the divisibility rule for ______.  

3

400
List all the factors of 27.
1,3,9,27
400
Is 0 prime or composite?
neither
400

What are the prime factors of 32? (Make a factor tree and write out your answer)

32=2x2x2x2x2

400
Find the GCF of 27 and 33.
27=3x3x3. 33=3x11, GCF=3
500
Is 7,422 divisible by 3? Why or why not?
Yes because 7+4+2+2=15 which is divisible by 3.
500
List all the factors of 40.
1,2,4,5,8,10,20,40
500
Is 87 prime or composite?
Composite
500

What are the prime factors of 34? (Make a factor tree and write out your answer)

34=2x17

500
What does the G, C and F stand for in GCF?
Greatest Common Factor
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