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Multiples%20and%20Factors

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Multiples and Factors Lesson 4.1 ... What are the factors of 18? What are the factors of 7? Prime and Composite Numbers Homework Time ... – PowerPoint PPT presentation

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Title: Multiples%20and%20Factors


1
Multiples and Factors
  • Lesson 4.1

2
Multiples
  • A multiple is formed by multiplying a given
    number by the counting numbers.
  • The counting numbers are 1, 2, 3, 4, 5, 6, etc.

3
Example List the multiples of 4
  • 4 x 1 4
  • 4 x 2 8
  • 4 x 3 12
  • 4 x 4 16
  • 4 x 5 20
  • 4 x 6 24

So, the multiples of 4 are 4, 8, 12, 16, 20, 24,
28, etc.
Counting Numbers
4
What are the first five multiples of 13?
13 x 1 13 13 x 2 26 13 x 3 39 13 x 4 52 13
x 5 65
13, 26, 39, 52, 65
5
Find the Missing Multiples
24
30
  • 6, 12, 18, ____, ____
  • ___, 6, 9, 12, ____, ____, 21
  • ___, 24, 36, 48, 60, ____

15
18
3
72
12
6
Factors
  • Factors are the numbers you multiply together to
    get a product.
  • For example, the product 24 has several factors.
  • 24 1 x 24
  • 24 2 x 12
  • 24 3 x 8
  • 24 4 x 6
  • SO, the factors are 1, 2, 3, 4, 6, 8, 12, 24

7
Finding Factors
  • Start with 1 x the number.
  • Try 2, 3, 4, etc.
  • When you repeat your factors, cross out the
    repeat - youre done at this point.
  • If you get doubles (such as 4 x 4), then youre
    done. Repeats or doubles let you know youre
    done.

8
What are the factors of 16?
1 x 16
2 x 8
3 x ??
3 is not a factor, so cross it out
4 x 4
doubles done
The factors of 16 are 1,2,4,8,16
9
What are the factors of 18?
1 x 18
The factors are 1,2,3,6,9,18
2 x 9
3 x 6
4 x ??
5 x ??
6 x 3
Repeat! Cross it out! Were done!
10
What are the factors of 7?
The only factors of 7 are 1,7
1 x 7
2 x ??
3 x ??
4 x ??
5 x ??
6 x ??
7 x 1
This works, but it is a repeat. We are done.
11
Prime and Composite Numbers
  • Prime numbers are
  • numbers that only have
  • two factors one, and the
  • number itself.
  • EXAMPLES
  • 3, 5, 7, 11, 31
  • Composite numbers
  • have more than two
  • factors.
  • EXAMPLES
  • 6, 18, 30, 100

12
Homework Time
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