Lesson 5-7 Pages 224-226

Least Common Multiple

What you will learn!

How to find the least common multiple of two or

more numbers.

MultipleMultiple

Least common multiple (LCM)Least common multiple (LCM)

What you really need to know!

A multiple of a number is the product of that number and any whole number. The least nonzero multiple of two or more numbers is the least common multiple (LCM) of the numbers.

Example 1: Method 1

Find the LCM of 4 and 6.

Multiples Multiples of 4of 4 44 88 1212 1616 2020 2424

Multiples Multiples of 6of 6 66 1212 1818 2424 3030 3636

Multiples Multiples of 4of 4 44 88 1212 1616 2020 2424

Multiples Multiples of 6of 6 66 1212 1818 2424 3030 3636

The LCM is 12

Example 1: Method 2

Find the LCM of 4 and 6.

224 326

12322 LCM

Example 2:

Find the LCM of 4 and 15.4 44 88 1212 1616 2020 2424 2828 3232 3636 4040 4444 4848 5252 5656 6060 6464

15 1515 3030 4545 6060 7575 9090 105105 120120 135135 150150 165165 180180 195195 210210 225225 240240

224 5315

605322 LCM

4 44 88 1212 1616 2020 2424 2828 3232 3636 4040 4444 4848 5252 5656 6060 6464

15 1515 3030 4545 6060 7575 9090 105105 120120 135135 150150 165165 180180 195195 210210 225225 240240

3222248

Example 3:

Find the LCM of 18, 24, 48

33218 322224

144332222

Page 225

Guided Practice

#’s 4-7

Pages 224-225 with someone at home and study

examples!

Read:

Homework: Page 226

#’s 8-22 even

#’s 26-35

Lesson Check 5-7

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576

Lesson 5-7

Lesson Check 5-7