5.19 Algebra

Which problem could be represented by the number sentence 12 + 3 = ?

• Terry had 12 toy cars. He gave 3 to his brother. How many cars does he have left?

• Terry has 3 more cars than his brother who has 12. How many cars does Terry have?

• Terry has 3 times as many cars as his brother who has 12. How many cars does Terry have?

• Terry has 12 cars. He puts them in 3 equal groups. How many cars are in each group?

A variable is a(n)

• equation

• expression

• unknown number

• number

Which mathematical expression represents the following verbal expression? “a number times 3”

• 3

• 3 - n

• 3 + n

• 3n

Which represents the unknown value in the following statement? 12 x n = 36

• 12

• x

• n

• 36

Which of the following word expressions is represented by the algebraic expression t x 4?

• 4 more than t

• 4 less than t

• the product of t and 4

• t divided by 4

Which problem could be represented by the number sentence 9 - b = 5?

• Tom had 9 trading cards and he gave some away. He now has 5 cards left?

• Tom had 9 trading cards and he gave 5 away. How many cards does he have left?

• Tom had 9 trading cards and was given some more. He now has 5 cards.

• Tom had 9 trading cards and he traded them equally among friends. He now has 5 cards.

Which open sentence represents “a number, y, decreased by 52 is 124”?

• y + 52 = 124

• y – 52 = 124

• y ÷ 52 = 124

• y x 52 = 124

Mrs. Fields has 26 pieces of candy to share equally with her students. Which is the variable in this situation? (What don't you know)

• the number of students

• the flavor of candy

• the amount of candy

• the color of candy

Lin has 3 cookies. Ron has 5 cookies. Which number sentence would you use to show how many cookies they have?

• 3 + c = 5

• 3 + 5 = c

• c + 5 = 3

• 5 - 3 = c

Mark had 12 cars. Together, Mark and Sara had 21 Cars. How many cars did Sara have? Which number sentence represents this problem?

• 12 + g = 21

• 21 + 12 =g

• g + 21 = 12

• 12 + 21 = g