Unit 1 IM 4th Grade Review

Prime/Composite Numbers

100

Is 27 a prime or composite number? Explain your thinking. 

27 is a composite number because it has more than one factor pair. 

1x27

9x3

200

Is 29 a prime or composite number? Explain your thinking. 

29 is a prime number because it only has one factor pair. 

29x1

300

Is 20 a prime or composite number? 

20 is a composite number because there are more than one factor pairs. 

20x1

2x10

4x5

400

Is 23 a prime or composite number? 

23 is a prime number because it has one factor pair.

1x3

500

Is 33 a prime or composite number?

33 is a composite number because there are more factors than 1 and itself. 

1x33

3x11

Factor Pairs

100

Find the factor pairs of 7.

1x7

200

Find the factor pairs of 5.

1x5

300

Find all factor pairs of 30.

1x30 

2x15

3x10

400

Find all factor pairs of 72.

1x72

2x36

3x24

4x18

6x12

9x8

500

Find all factor pairs for 60. 

1x60

2x30

3x20

4x15

5x12

6x10

Word Problems

100

Jess is sharing skittles with her friends. The number of skittles never changes, but the number of friends does. 

With 6 people, the skittles can be equally divided between everyone. Could there be 40 skittles?

No. 6 is not a factor of 40.. There would be leftover skittles. 2 could get 6 skittles, but 4 people would get 7 skittles. Therefore, it is not possible for the 40 skittles to be divided equally between the 6 people. 

200

Jess is sharing skittles with her friends. The number of skittles never changes, but the number of friends does.

With 10 people, the skittles can be equally divided between everyone. Could there be 40 skittles?

Yes! 10 is a factor of 40. 40 is a multiple of 10. With 10 people, each person would get 4 skittles. 

300

Jess is sharing skittles with her friends. The number of skittles never changes, but the number of friends does.

With 7 people, the skittles can be equally divided between everyone. How many skittles could there be?

Ex: There could be 42 skittles, meaning each person would get 6 skittles 

Ex: There could be 70 skittles, meaning each person would get 10 skittles

Random

100

What are the multiples of 5 up to 40.

5, 10, 15, 20, 25, 30, 35, 40

200

Select all true statements. 

D. The only factor pair of 27 is 1 and 27. 

E. The factor pairs of 14 are 14 & 1, and 2 & 7. 

E

300

Select all true statements. 

A. 24 is a mutiple of 8. 

B. 90 is a multiple of 3. 

C. 18 is a factor of 6.

A & B

400

What is a factor?

Factors are numbers that can be multiplied together to produce a given number

500

What is a multiple?

Skip counting