Agenda Monday, Nov. 16

Homework 5 p. 239 # 10 - 17, 22 - 30, 49 - 52

Please check to see if you have any missing assignments -

turn them in or come for working lunch

Daily Scribe? -

Least Common Multiple

Introduction of Thanksgiving project.

What is the least common multiple?

The least common multiple of two numbers is the smallest number (not including 0 or 1) that is a multiple of both.

Example: What is the LCM of 3 and 4?

Multiples of 3: 3, 6, 9, 12, 15, 18... Multiples of 4: 4, 8, 12, 16, 20...

The least common multiple of 3 and 4 is 12.

Find the LCM of the following number pairs.

Multiples of 4:

Multiples of 5:

The LCM of 4 and 5 is:

Multiples of 6:

Multiples of 8:

The LCM of 6 and 8 is:

Multiples of 10:

Multiples of 30:

The LCM of 10 and 30 is:

Multiples of 8:

Multiples of 24:

The LCM of 8 and 24 is:

Find the LCM of the following number pairs.

You can also find the LCM using prime factorization.

2 12 2 8 Write the prime factorization 2 6 2 4 3 2

Use the GREATEST power of 22 * 3 23 each factor.

23 * 3 8 * 3 = 24 Write the Least Common Multiple

as a product.

Use a venn diagram.

1215

3 * 52 * 2 * 3

523

2

2 * 2 * 3 * 5

22 * 3 * 5

4 * 3 * 5 = 60

Use the venn diagram just like for GCF. But multiply all the prime factors for the LCM

Find the LCM of the following number pairs using the venn diagram method.

8 and 15 15 and 30

Find the LCM of the following number pairs using the venn diagram method.

32 and 12 24 and 10

Now for variable expressions

12abc15ab2

3 * 5 * a * b * b 2 * 2 * 3 * a * b * c

523

2

2 * 2 * 3 * 5 * a * b * b * c

22 * 3 * 5ab2c 4 * 3 * 5ab2c

60ab2c

a

bb c

Find the LCM of the following expressions using the venn diagram method.

3x2y and 12xy

Find the LCM of the following expressions using the venn diagram method.

20mn3 and 6m

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