Unit 6 Review TransMath Level 1

Divisibility Rules

100

Every number is divisible by ___.

1

200

Is 456 divisible by 2? Why or why not?

Yes because it ends in 6 (or ends in an even number).

300

Is 794 divisible by 5? Why or why not?

No because it doesn't end in 0 or 5.

400

Is 120 divisible by 6? Why or why not?

Yes because the last digit (0) is even (divisible by 2), and 1 + 2 + 0 = 3 (divisible by 3). Therefore, 120 is divisible by 6. 

500

Is 562 divisible by 3? Why or why not?

No because 5+6+2=13 which is not divisible by 3.

Factors/Misc

100

List all the factors of 21.

1,3,7,21

200

List all the factors of 13

1,13

300

Congruent means 

Identical or the same shape and size

400

List all the factors of 32.

1,2,4,8,16,32

500

Similar means

Same but different size

Square Number& Even/Odd

100

Even/Odd 54+63

ODD

200

Even/Odd   102*3

EVEN

300

The missing square number consecutive of:

121, 144, ____, 196, 225

169

400

True/False: This list is all square numbers

1,4,9,16,25

True

500

True/False: This list is all square numbers

1, 3, 9,27,81 

False

Common Factors/Prime Factorization Tree

100

These are the common factors between 21 and 32

21= 1,3,7,21     

32= 1,2,4,8,16,32

Same factors 1

200

These are the common factors between 18 and 24

18: 1,2,3,6,9,18

24: 1,2,3,4,6,8,12,24

Common Factors: 1,2,3,6

300

Make Factor Tree to find the prime factorization of 50 and 75

50: 2,5,5

75: 3,5,5

Prime Factorization is 5x5 = 25

400

Find the prime factorization of 50. (Make a factor tree and write out your answer)

50=2x5x5

500

Find the prime factorization of 81. (Make a factor tree and write out your answer)

81=3x3x3x3

GCF

100

If two numbers have nothing in common from their factor trees, what is their GCF?

1

200

Find the GCF of 5 and 20.

5, 20=2x2x5, GCF=5

300

Find the GCF of 12 and 18.

12=2x2x3, 18=2x3x3, GCF=2x3=6

400

Find the GCF of 7 and 11.

GCF=1

500

Find the GCF of 8 and 28.

8=2x2x2, 28=2x2x7, GCF=2x2=4