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Multiplying & Dividing Algebra~ Lesson 6

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Remember Addition and Subtraction? Kinda the same idea…

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Except now, we are working with multiplication and division. Remember… They are opposites. So they undo each other.

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Remember… In Algebra, we have to do a little organizing before we can solve for the right answer.

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You know, put like things together on the same side of the equation.

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4x = 24 Imagine a dividing line through the equal sign. Remember…

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4x = 24 Remember… Letters go on one side and numbers go on the other. L#L#

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4x = 24 L#L# Notice that it is tied to the X by multiplication. How can you undo multiplication? DIVISION!

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4x = 24 L#L# 4 The division undoes the multiplication on this side, so the four is cancelled out.

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4x = 24 L#L# 4 What you do to one side of the equation, you must do to the other.

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4x = 24 L#L# 4 What you do to one side of the equation, you must do to the other. x = 6

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Lets try a few… 3m = 12 36 = 3j 5s = 135 m = 4 13 = j s = 27

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Now…lets undo division!

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x = 24 Imagine a dividing line through the equal sign. Remember… 2

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x = 24 2 Notice that it is tied to the X by division. How can you undo division? MULTIPLICATION! 2

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x = 24 2 2 The division undoes the multiplication on this side, so the four is cancelled out.

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x = 24 2 2 The division undoes the multiplication on this side, so the four is cancelled out.

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x = 24 2 2 The division undoes the multiplication on this side, so the four is cancelled out. x = 48

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Lets try a few… m = 5 6 10 = w 3 m = 30 30 = w

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Homework Time!

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Warm Up Solve. 1. x + 5 = 9 2. x – 34 = 72 = x – 39 x = 4 x = 106

Warm Up Solve. 1. x + 5 = 9 2. x – 34 = 72 = x – 39 x = 4 x = 106

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