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Grade 7 Exponents

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by

Colleen Lee

on 18 September 2012

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Transcript of Grade 7 Exponents

Class: 7L Exponents The Cyber Squad is trying to escape from a desert island by crossing a large body of water.
They find a special lily pad that was left for them by the Red Warrior. When the lily pad is put in
water it doubles and the number of lily pads keeps on doubling. Lily Pad Escape *Work Sheet When numbers are repeated in multiplication, we can write them in exponent form. For example, we can write 2 x 2 x 2 as 2 is the base.
3 is the exponent. is the power. We say: 2 to the power of 3, or 2 to the 3rd. We can see how quickly the power gets very large. A power with exponent 2 is a square number.
The area of a square is side length x side length. Square numbers and cube numbers are special powers This square has side length 5 cm.
Area = 5 cm x 5 cm
= 25 cm2

Here are 3 ways to write 25:
Standard form: 25
Expanded form: 5 x 5
Exponent form: 5 5 squared is a power of 5.
25 is called a perfect square. A power with exponent 3 is a cube number.
The volume of a cube is edge length x edge length x edge length.
This cube has edge length 5 cm.
Volume = 5 cm x 5 cm x 5 cm
= 125 cm3
Therefore, 125 is a perfect cube. Write in exponent form.
a) 6 x 6 b) 7 x 7 x 7 c) 32 Example 1 Solution a)
b)
c) Work on MMS
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