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Big Ideas Math: Modeling Real Life, Grade 6

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Big Ideas Math: Modeling Real Life, Grade 6 View details

2. Solving Equations Using Addition or Subtraction

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Exercise 1 Page 256

The word is divides the sentence into what should be on the left-hand side and what should be on the right-hand side of the equation.

x+9=15

Practice makes perfect

We have been given a sentence and we need to translate it into an equation.

The sum of a number x and 9 is 15.

Every equation has an equals sign and values or expressions on either side of it. Key phrases, such as is, is equal to, and equals tell us about the placement of the equals sign.

The sum of a numberxand9 is 15. ⇕ The sum of a numberxand9 = 15. On the left-hand side we have a key word: sum. This word tell us the operations that will be used in our equation. Sum indicates addition. The sum of a numberx and 9 x + 9 On the right-hand side, we only have a number 15. Putting these sides together, we have a complete equation. x + 9 = 15

Subchapter links

Try It p.252-254

Self-Assessment for Concepts & Skills p.254

Self-Assessment for Problem Solving p.255

Review & Refresh p.256

Concepts, Skills, & Problem Solving p.256-258