7.EE.2 Practice

7.EE.2 Practice

By Nina Stark

​If you have an original value of x and the value of that increases then the coefficient attached to the x to represent the situation would be greater than 1.

Example: ​Last year the class population was p. This year the class population is 1.15p.

• ​This means that the population increased by 15% because 1.15 as a percent would be 115%, which is 15% more than the original.

Example: Last year the class population was p. This year the class population is .65p.

• This means that the population decreased by 35% because .65 as a percent would be 65%, which is 35% less than the original.​

Multiple Choice

Maria bough a used car for x dollars. One year later the value of the carwas 0.88x. Which expression is another way to describe the value of the car?

• 0.12% decrease

• 0.88% decrease

• 12% decrease

• 88% decrease

Multiple Choice

The population of a city is expected to increase by 7.5% next year. If p represents the current population, which expression represents the expected population next year?

• 1.75p

• 1.075p

• p + 0.075

• 1 + 0.075

Multiple Choice

Sally has a discount card that reduces the price of her grocery bill in a certain store by 5%. If c represents the cost of Sally's groceries. Which expression represents Sally's grocery bill?

• 0.05c

• 0.95

• c - 0.05c

• c + 0.05c

Multiple Choice

The original selling price of a share of stock was d dollars. The selling price for a share of the same stock at a later date was represented by the expression 1.15(0.95d). Which description could explain what happened to the price of the share of stock?

• The price decreased by 5% and then increased by 0.15%

• The price decreased by 95% and then increased by 0.15%

• The price decreased by 5% and then increased by 15%

• The price decreased by 95% and then increased by 15%

What is perimeter?

Perimeter is the measurement around the surface of an object. If you wanted to find the perimeter of a;

• square - multiply one side by 4, or add the side up 4 times

  • ex) One side of a square is 2x - 5, so the perimeter is 4(2x-5) or 2x - 5 + 2x - 5 + 1x - 5 + 2x - 5... Both reduce to 8x - 20.

• rectangle - has two congruent sides. So multiply each dimension by 2 and then add them up, or add all 4 sides.

  • ex) If the length of a rectangle is 3w + 1 and the width is w + 2 then the perimeter is 2(3w +1) + 2(w + 2) or 3w+1 + 3w+1 + w+2 + w+2.... both reduce to 8w + 6.

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Multiple Choice

the measure of one side of a square is (s + 3) inches long. Which pair of expressions represents the perimeter of this square?

• 2s + 3 and

  (s+3)+(s+3)

• 2(s+3) and

  (s+3)+(s+3)

• 4s + 3 and

  (s+3)+(s+3)+(s+3)+(s+3)

• 4s + 12 and

  (s+3)+(s+3)+(s+3)+(s+3)

Multiple Choice

What is the perimeter of the rectangle?

• 4n + 8

• 2n + 2

• 4n

• 2n + 8

Open Ended

1. What is the easiest thing about this standard?

2. What confuses you about the standard?

Poll

How do you feel about 7.EE.2: Understand that rewriting an expression in different forms in a problem context can shed light on the problem and how the quantities in it are related.

• I'm conflicted

• It makes some sense

• I actually mostly get it

• I feel like a PRO!