Download Prime and Composite Number, Factor Trees, GCF

Prime and Composite Number, Factor Trees, GCF and LCM Worksheet
1.Prime and Composite numbers
a) List all of the factors for the number 4.
Is 4 a prime or composite number?
b) List all of the factors for the number 11. Is 11 a prime or composite number?
c) List all of the factors for the number 16. Is 16 a prime or composite number?
d) List all of the factors for the number 23
Is 23 a prime or composite number?
2. Use a factor tree to find the prime factorization.
54
2)
20
1)
4)
5)
100
70
3. Find the GCF and LCM for each of the sets of numbers:
a. 20 and 8
GCF=
LCM =
b. 12 and 21
GCF=
LCM =
c. 30 and 65
GCF=
LCM =
d. 20 and 36
GCF =
LCM =
e. 12, 18 and 32
GCF=
LCM =
3)
72
6)
24
Part A:
Make a list of all the perfect squares from 1 to 400 on the back of this sheet
(these should be memorized!)
I'll get you started...
Remember, these are the perfect squares!
1 x 1 = 1
now you finish the list!
2 x 2 = 4
Part B:
1. What does the square root equal? Example: a) b) (4 marks)
c) d) 2. The following numbers are the square root of which perfect square? Example: (4 marks)
a) 11
c) 3
b) 5
d) 8
3. What does the square root equal? Example: a) (4 marks)
c) b) d) 4. What does the square root equal? Example: a) b) d) (4 marks)
c) Finished list: Make sure yours looks like this :)
1 x 1 = 1
11 x 11 = 121
2 x 2 = 4
12 x 12 = 144
3 x 3 = 9
13 x 13 = 169
4 x 4 = 16
14 x 14 = 196
5 x 5 = 25
15 x 15 = 225
6 x 6 = 36
16 x 16 = 256
7 x 7 = 49
17 x 17 = 289
8 x 8 = 64
18 x 18 = 324
9 x 9 = 81
19 x 19 = 361
10 x 10 = 100
20 x 20 = 400