4.OA.3: Represent problems using equations with variables

Jeremy was given $30 to spend at the carnival. He spent $5 on cheese fries, $13 on ice cream, and $4 on a stuffed animal. If m represents how much money Jeremy has left, choose the equation below that represents how much money he has left.

• 30 - (13+4+5) = m

• m = 13 + 4 + 5

• 30 = m + ( 13 - 4 - 5)

• ( m - 13 ) + 4 + 5 = 30

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CCSS.HSA.CED.A.3

Micah has $75. He spent $23 on a shirt. He also bought two ties atf the same price. Which model shows this relationship?

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CCSS.HSA.CED.A.3

Brandon made 60 cookies to give to his teachers. If Brandon has already given 3 of his teachers 12 cookies each, choose the equation below that represents how many cookies Brandon has left (c).

• 60 - (12 ÷ 3) = c

• c = 60 - 3 - 12

• c = (3+12) - 60

• 60 - (3 x 12 ) = c

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CCSS.HSA.CED.A.3

Josh wants to exercise a total of 50 minutes this week. He exercised for 25 minutes on Monday and 15 minutes on Tuesday. If m equals the number of minutes left to exercise, which equation can Josh use to find how much more time he should exercise?

• 25 + 15 + 50 = m

• 25 + 15 + m = 50

• m - 25 - 15 = 50

• 50 + 25 - 15 = m

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CCSS.HSA.CED.A.3

Lisa has a collection of 72 stamps. If she decides to divide them equally among her 8 friends, including herself, how many stamps does each person get? Let s represent the number of stamps each person gets. Choose the correct equation below to solve for s.

• 72 + s = 8

• s - 8 = 72

• 72 ÷ s = 8

• 72 ÷ 8 = s

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CCSS.HSA.CED.A.3

During a school fundraiser, Kevin sold 15 tickets in the morning and twice as many in the afternoon. If t represents the total number of tickets Kevin sold, select the equation that best represents this situation.

• t = 15 + 2

• t = 15 + (15 x 2)

• 15 ÷ 2 = t

• t = 15 - (15 x 2)

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CCSS.HSA.CED.A.3

Emily reads 30 pages of a book each day. If she wants to finish the book in 10 days, and p represents the total number of pages in the book, which equation should she use to find p?

• 30 + 10 = p

• p - 30 = 10

• 30 x 10 = p

• p ÷ 30 = 10

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CCSS.HSA.CED.A.3

Susan has 5 red balloons and 3 times as many blue balloons. If b represents the total number of balloons Susan has, select the equation that best represents this situation.

• b = 5 + 3

• b = 5 x 3

• b = 5 + (5 x 3)

• b = 5 - (5 x 3)

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CCSS.HSA.CED.A.3

Mrs. Smith is buying colored pencils for her classroom. She bought 4 new packs with 12 pencils in each pack. If Mrs. Smith divides the total number of pencils evenly into 6 tubs, how many pencils will be in each tub (p)? Choose the equation below that best represents the problem.

• (4 x 12 ) ÷ 6 = p

• (6 x 12) ÷ 4 = p

• 4 + 6 + 12 = p

• (6 x 4) ÷ 12 = p

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CCSS.HSA.CED.A.3

How do you feel about solving problems with equations using letters to represent unknown values? There is no wrong answer!

• I feel great!

• I feel confused and need help.

• I feel ok. Some problems are more challenging than others.

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CCSS.7.EE.B.4A