Question

Below is a piece of a local pizza place menu where Jacob works.

Large Cheese Pizza $14.85
Large Supreme Pizza $16.90
Cheese Sticks $5.99
Dessert Pizza $6.99











Use the information above to answer the following questions.

1. A customer has $75 to spend for a pizza party and knows she needs 3 supreme pizzas. Jacob tells her she can also afford to buy 4 dessert pizzas. Is this reasonable? Justify your response using estimation. If the answer is not reasonable, identify the error and then calculate the correct solution.













2. A family comes in with a coupon for $5 off any purchase and wants to know how much it will cost for 1 large supreme pizza and 1 order of cheese sticks if they use their coupon. Jacob says it will be $17.89. Is this reasonable? Justify your response using estimation. If the answer is not reasonable, identify the error and then calculate the correct solution.
















3. A customer calls in a delivery order for 3 large cheese pizzas and 2 dessert pizzas. The customer wants to give a 20% tip to the delivery driver. Jacob says that $5 would be about 20%. Is this reasonable? Justify your response using estimation. If the answer is not reasonable, identify the error and then calculate the correct solution.











4. The largest order last Saturday was from a basketball team that ordered 5 large supreme pizzas, 5 large cheese pizzas, 5 orders of cheese sticks and 5 dessert pizzas. Jacob said the total was about $225. Is this reasonable? Justify your response using estimation. If the answer is not reasonable, identify the error and then calculate the correct solution.













5. Adding additional toppings to a large cheese pizza cost $1.39 per topping. The equation 14.85 + 1.39x = 20 can be used to determine the number of toppings that can be added to a large cheese pizza for a total of $20. Jacob solves the equation and says you can get 4 toppings added if you have $20. Is this reasonable? Justify your response. If the answer is not reasonable, identify the error and then calculate the correct solution.

Answer 1

1)

16.90 is about $17

$17 * 3 = 51

6.99 is about $7

7 * 4 = 28

28 + 51 = 79

This is not reasonable because it costs $79, which is more than $75.

7 * 3 = 21

21 + 51 = 72

The customer has enough for 3 supreme pizzas and 3 dessert pizzas.

2)

16.90 is about 17

5.99 is about 6

17 + 6 = 23

23 - 5 = 18

This is reasonable.

3)

14.85 is about 15

6.99 is about 7

15 + 7 = 22

22/100 = 0.22

0.22 * 22 = 4.84

This is reasonable.

4)

16.90 is about 17

14.85 is about 15

5.99 is about 6

6.99 is about 7

17 * 5 = 85

15 * 5 = 75

6 * 5 = 30

7 * 5 = 35

85 + 75 + 30 + 35 = 225

This is reasonable

5)

14.85 + 1.39(4) = 20

1.39 * 4 = 5.56

14.85 + 5.56 = 20.41

This is not reasonable because the total is more then $20.