1. Lesson 2-3: Solving Equations by Multiplication and Division Algebra 1 CP Mrs. Mongold

2. Multiplication Property of Equality If you multiply each side of the equal sign by the same number, the equation is true

3. Multiplication Property of Equality

4. Division Property of Equality If you divide each side of the equal sign by the same number, the equation is true

5. Division Property of Equality If you divide each side of the equal sign by the same number, the equation is true ◦ Think about “undoing” multiplication by doing the opposite which is division 13s = 195-3x = 36

6. Things to remember Always get the variable by itself by “undoing” the operation in the equation Dividing by a fraction is the same as multiplying by its reciprocal Double check your answer after you find a solution to make sure you didn’t make a simple mathematical mistake!!

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67. Examples page 20 13. One-fifth of a number equals 25. Find the number.

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69. Examples page 20 14. What number divided by 2 equals - 18?

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71. Examples page 20 15. A number divided by eight equals 3. Find the number.

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73. Examples page 20 16. One and a half times a number equals 6. Find the number.

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