Day2-7

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Welcome to Math Ms. Li Room 504

Warm Up

• Take out last night’s homework and put it on  your desk • Inverse Operations worksheet – Work on this independently and silently – I will be calling you up to assign your textbook

• If you finish early:

– Open your math journal – Draw a 13 x 13 table – Write your multiplication times tables 1 2 … 12

1

2

1

2

… 12

Objectives • Define the two parts of the power. • Write the verbal phrase for powers. • Evaluate powers.

Agenda • • • •

Warm Up / Textbook Distribution Lesson on powers Powers practice Start homework

Note­taking • Take out your math journal. • Write the date in the upper right hand  corner. • On the top line in the middle, write  Powers and Exponents.

Powers • A power has two parts: a base and an  exponent. • Base: the number to be multiplied – Can be any number

• Exponent: the number of times a base  is repeated as a factor.

Example

4

5

• Base • Exponent

Example

6

3

• Base • Exponent

Algebraic Expression • Base • Exponent

b

n

• b  = b x b x b (n times) n

Example

4

5

• Equals 4 x 4 x 4 x 4 x4 • Does NOT equal 4 x 5

Example

6

3

• Equals • Does NOT equal

Example

a

5

• Equals • Does NOT equal

Example

12 x 12 x 12 x 12 4 12 •

Example

3 x 3 x 3 x 3 x 3

Verbal Phrase

4

5

• 4 to the fifth power

Verbal Phrase

6

3

• 6 to the third power

Verbal Phrase

9

2

Applications of Exponents • Area (cm2) = s2 • Volume (cm3) = s3

Applications of Exponents • Area (cm2) ­ squared • Volume (cm3) ­ cubed

Verbal Phrase

8

2

• 8 to the second power • 8 squared

Verbal Phrase

7

3

• 7 to the third power • 7 cubed

Pair Practice • Whispers of Practice

Pair Practice • • • •

Take out the half worksheet Work in pairs Put problems on the board One writer, one explainer

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