7th Grade Math

Extra Practice EP17

Extra Practice

Multi-Part Lesson 6-2 (continued)

PART D PAGES 342–343

Solve each problem using the reasonable answers strategy.

1. SKIING Emil skied for 13.5 hours and
   estimated that he spent 30% of his time
   on the ski lift. Did he spend about 4,
   6, or 8 hours on the ski lift?


2. GAS MILEAGE Holden’s car gets 38 miles
   per gallon and has 2.5 gallons of
   gasoline left in the tank. Can he drive
   for 85, 95, or 105 more miles before he
   runs out of gas?
   2. CLASS TRIP The class trip at Wilson
   Middle School costs $145 per student.
   A fundraiser earns 38% of this cost.
   Will each student have to pay about
   $70, $80, or $90?
   4. DINING At a restaurant, the total cost
   of a meal is $87.50. Dawn wants to
   leave a 20% tip. Should she leave a
   total of $95, $105, or $115?

Multi-Part Lesson 6-3: Applying Percents

PARTS A B PAGES 345–350

Find each percent of change. Round to the nearest whole percent

if necessary. State whether the percent of change is an increase

or decrease.

1. 450 centimeters to 675 centimeters 2. 77 million to 200.2 million


2. 500 albums to 100 albums 4. 350 yards to 420 yards


3. 3.25 meters to 2.95 meters 6. $65 to $75


4. 180 dishes to 160 dishes 8. 450 pieces to 445.5 pieces


5. 700 grams to 910 grams 10. 55 women to 11 women


6. 412 children to 1,339 children 12. 464 kilograms to 20 kilograms


7. 24 hours to 86 hours 14. 16 minutes to 24 minutes

PART C PAGES 351–354

Find the total cost to the nearest cent.

1. $45 sweater; 6% tax 2. $29 shirt; 7% tax


2. $145 coat; 6.25% tax 4. $12 meal; 4.5% tax


3. $105 skateboard; 7 ^1
   2
   % tax 6. $12,500 car; 3 ^3
   4
   % tax


4. $49.95 gloves; 5 _^1
   4
   % tax 8. $525 stereo; 6% tax


5. DINNER The Lombardo family went out to dinner and the cost of their
   meal was $62. If they left a 20% tip, how much did they leave?


6. HAIR CUTS The total cost of Mrs. Draper’s haircut including tip was $38.
   If she gave her hair dresser a 20% tip, how much was her haircut?


7. LAWN CARE Jordan earned $35 for taking care of his neighbor’s lawn.
   Suppose the neighbor gave him a 15% tip. What would be the total
   amount Jordan earned?

EP2_EP36_ExtPract_M1_895130.indd EP17 1/6/10 11:46 AM