Math Review

Divisibility

100

Is 390 divisible by    

 2      3     5     6     9     10

2-yes

3-yes

5-yes

6-yes

9-no

10-yes

200

Is 369 divisible by    

 2      3     5     6     9     10

2-no

3-yes

5-no

6-no

9-yes

10-no

300

Is 1, 674 divisible by    

 2      3     5     6     9     10

2-yes

3-yes

5-no

6-yes

9-yes

10-no

400

Is 12,930 divisible by    

 2      3     5     6     9     10

2-yes

3-yes

5-yes

6-yes

9-no

10-yes

500

Is 32,175 divisible by    

 2      3     5     6     9     10

2-no

3-yes

5-yes

6-no

9-yes

10-no

Factors

100

What are the factors for 10?

Is 10 prime or composite?

Factors:  1, 2, 5, 10

Composite

200

What are the factors for 20?

Is 20 prime or composite?

Factors:  1, 2, 4, 5, 10

Composite

300

What are the factors for 23?

Is 23 prime or composite?

Factors:  1, 23

Prime

400

What are the factors for 36?

Is 36 prime or composite?

Factors:  1, 2, 3, 4, 6, 9, 12, 18, 36

Composite

500

What are the factors for 24?

Is 24 prime or composite?

Factors:  1, 2, 3, 4, 6, 8, 12, 24

Composite 

Multiples

100

Identify the first five multiples of 6

6, 12, 18, 24, 30

200

Identify the first five multiples of 9

9, 18, 27, 36, 45

300

Identify the first five multiples of 12

12, 24, 36, 48, 60

400

Identify the first five multiples of 7

7, 14, 21, 28, 35

500

Identify the first five multiples of 25

25, 50, 75, 100, 125

Prime Factorization

100

Make a factor tree for 36 and then write the prime factorization

Factor Tree:  See board

PF = 2*2*3*3

200

Make a factor tree for 56 and then write the prime factorization

Factor Tree:  See board

PF = 2*2*2*7

300

Make a factor tree for 43 and then write the prime factorization

Factor Tree:  See board

PF = 1*43

400

Make a factor tree for 100 and then write the prime factorization

Factor Tree:  See Board

PF = 2*2*5*5

500

Make a factor tree for 71 and then write the prime factorization

Factor Tree:  See Board

PF = 1*71

Greatest Common Factors

100

What is the GCF 35 and 45?

GCF = 5

200

What is the GCF of 81 and 63?

GCF = 9

300

What is the GCF of 22 and 11?

GCF = 11

400

What is the GCF of 8 and 24?

GCF = 8

500

What is the GCF of 20 and 23?

GCF = 1