2.4 Operations with Square Roots
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Operations with Square Roots Lesson Sept 25 and Sept 29 2014
Transcript of 2.4 Operations with Square Roots
2.4 Operations with Square Roots.notebook
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October 01, 2014
2.4 Operations with Square Roots
What does 32 mean? What does 52 mean?
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Definition: A square root is a number that when multiplied by itself equals a given number.
Example: Use the definition to explain the square root of 4
We use the √ symbol to indicate a square root. Therefore....
2.4 Operations with Square Roots.notebook
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We can visualize what a square root is. For example, the diagram below represents √9
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Perfect squares are numbers that can be expressed by two equal integers.
For example, 4 is a perfect square... 4 = 2 x 2
Here are the perfect squares that you should know...
1
4
9
16
25
36
49
64
81
100
121
144
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You can find the square root of any number by estimating. We estimate by finding how that number relates to the two nearest perfect squares...
Example:
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You try!
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You try!
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We can also determine the square roots of fractions!! The best way to do this is to look at an example...
Find
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We can do square roots of decimals if we think of them as fractions...
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Problem:A square garden has an area of 19 m2. Estimate then calculate the side length of the garden.
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Problem:A frame measures 30 cm by 20 cm. Can you mount a square picture with an area of 500 cm2 in the frame? Explain why or why not.
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