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Understand Variables in Algebra (A)

Understand Variables in Algebra (A). Unit 10 Lesson 1. What is Algebra?.

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Understand Variables in Algebra (A)

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  1. Understand Variables in Algebra (A) Unit 10 Lesson 1

  2. What is Algebra?

  3. In an equation or expression with an unknown value, you can use a letter to represent that value. For example, in the equation 6 + a = 11, the letter a represents an unknown value that makes the sentence true Let's learn more about using letters to represent values in this lesson.

  4. How to write an equation!

  5. More Practice

  6. Try this!

  7. We can multiply…

  8. and divide too!

  9. Look at these equations. In each, a letter has been used to represent an unknown value. There is a certain way to read equations such as these.

  10. Includes numbers and different kinds of symbols • Isn’t a number sentence, but can be part on one.

  11. Number sentence that shows 2 quantities are equal • Can be addition, subtraction, multiplication or division. • Always has an = sign

  12. Symbol that stands for a quantity • Can be many possible quantities • Expressions and equations can have variables

  13. Suppose every afternoon at 2:30, you read one chapter in a book. • On Monday, you read one chapter in 30 minutes. On Tuesday, you read another chapter in 47 minutes. How many more minutes did you read on Tuesday than on Monday? • The variable t can represent the difference between 30 minutes and 47 minutes. • 47 – 30 = t

  14. Which expression represents an unknown number increased by 10?

  15. Which expression represents the difference between 18 and an unknown number?

  16. Which equation best represents this situation? The sum of 21 and an unknown number is equal to 30.

  17. Which equation best represents this situation? Forty-three minus an unknown number equals 86.

  18. Jodie walked 19 fewer minutes than Trudie. Which expression shows the number of minutes Jodie walked?

  19. Tom's grandmother gave him $10. Now Tom has $34. Which equation can be used to calculate how much money Tom had before his grandmother gave him some money?

  20. Bill bought 4 more goldfish. Now he has 24. Which equation can be used to calculate the number of goldfish Bill had before he bought some more?

  21. Nina has 25 tennis balls and Hal has 30. Which equation can be used to calculate how many more tennis balls Hal has than Nina?

  22. Questions??

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