7-1A, C, and D: Solving and Writing Addition Equations

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Presentation transcript:

7-1A, C, and D: Solving and Writing Addition Equations 6th Grade Advanced/Pre-IB Mathematics

What is an Equation? A mathematical sentence showing two expressions are equal Example: 2 + 7 = 9 Recall: How are equations different from expressions?

How is a balance or scale similar to an equation? Think Pair Share How is a balance or scale similar to an equation? 7 + 2 = 9

Solve each equation mentally 3h = 15 24 ÷ w = 8 a + 7 = 11 e – 9 = 16 h = 5 w = 3 a = 4 e = 25

Example

Practice using the “balance” idea or “guess and check” 1. 1 + x = 8 2. x + 2 = 7 3. 9 = x + 3 1 + 7 = 8 5 + 2 = 7 9 = 6 + 3

Inverse Operations 8 = x + 3 5 = x What is the opposite of adding? ** In addition questions, we are really SUBTRACTING to solve the problem 8 = x + 3 Our goal is to “isolate” the variable. (It wants to be alone!) Whatever you do to one side, you must do to the other! - 3 - 3 5 = x

Solve using inverse operations. Remember to isolate the variable. - 2 - 2 - 5 - 5 - 3 - 3 c = 3 1 = x y = 9

Writing Addition Equations So, the average female gorilla weighs 198 pounds.

Your Turn! 7 + p = 19 The other piece measures 12 meters. - 7 - 7 p = 12

Brain Break

Round Table Your team will receive one piece of colored paper Draw 8 boxes on your paper Each team member will take turns solving various problems on page 375 Solve #8, 10, 12, 14, 16, 18, 20, 22

Homework WB pages 101-102 and 105-106 ODDS due Thursday (white) and Friday (green)