Warm up1. 2 • 2 • 2 =2. 3 • 3 • 3 • 3 =3. 5 • 5 • 5 =4. 4 • 4 • 4 =5. You have just installed a water pond in your

backyard. You intend to place water lilies in the pond. According to the package a water lily doubles in size every day. From the time you install the first lily until the entire surface of the pond is covered will take 20 days. How long will it take the pond to be half covered?

Exponents 7th Grade Mathematics

Today we will represent numbers by using exponents

VocabularyLook up the following terms and write their

definitions in your notebook.

1. power2. exponent3. base

Evaluating powers Find each value.

A. 52 F. 112

B. 26 G. 83

C. 44 H. 51

D. 73 I. 23

E. 34 J. 30

Recall Any number to the first power is equal to that

number.Example: 61 = 6 131 = 13 251

= 25 Any number to the zero power, except zero, is equal to 1.

Example: 60 = 1 100 = 1

190 = 1

Find each value.

1. 22 + 25

2. 34 + 33

3. 62 + 60

4. 33 + 42 - 51

Real-World Example On Monday, Erik tells 3 people a

secret. The next day each of them tells 3 more people. If this pattern continues, how many people besides Erik will know the secret?

Write Describe the relationship between 35

and 36.

Answer: The value of 36 is 3 times the value of 35 . 36 = 729 and 35 = 243.

Write

Is 25 greater than or less than 33? Explain your answer.

Write (Journal)

Think about how exponents can be used to write large numbers more efficiently. Write an explanation about why this is useful and give examples to show the efficiency of this method.

Homework Textbook p. 62 (10-21; 36-44)