FORMULAS

Formulas are equations that state rules about relationships

A = LW

Area of a rectangle  =  Length times Width

P = 2L + 2W

Perimeter of a rectangle = (2 x length) + (2 x width)

D = RT

Distance traveled = rate x time traveled

C = NP

Cost = number of items x price per item

 

Complete each statement with a variable expression

1.

A rectangle has width 6 units and length x units.  Its area is   ____ square units.

2.

A rectangle has width y and length 14.  Its perimeter is   ____ .

3.

You travel for ( t - 2 ) hours at 75 miles/hour.  You travel ____  km.

4.

You buy ( m + 5 ) bagels at 35 cents each.  The cost is   ____ cents.

5.

Al earns ( p + 3 ) dollars per hour.  In 8 hours he earns   ____ dollars.

6.

Our house is y years old.  Four years ago it was  ____ years old.

7.

The Golden Gate Bridge was built n years ago.  Three years from now it will have been standing  ____ years.

8.

A sports arena was d years old 15 years ago.  It is now ____ years old.

9.

Nine years from now Fenway Park will be g years old.  It is now  ____ years old.

10.

Mike jogs for half an hour at y miles an hour.  He jogs   ____ miles.
11. Workers on an assembly line produce ( x + 10 ) cars each day.   In 5 days they produce   ____ cars.
12. A conveyer belt moves at n yds./min.  In 10 minutes it moves   ____ yds.
13. I drove for three hours at r miles/hour   How far did I go?  ____
14. Dick drove for h hours at 85 km/hour.  How far did he go?   ____
15. Pencils cost p cents each.  How much will 5 pencils cost?   ____
16. Yogurt costs 75 cents per container.  How much will x containers cost?  ____
17. Sketch a rectangle having length 1 and width 5.  What is its area?  ____
18. Sketch a rectangle having length 7 and width w.  What is its perimeter?  ____
19. Pencils cost p cents each and notebooks cost n cents each.   How much will 3 pencils and 2 notebooks cost?  ____
20. Shirts cost $20 each and ties cost $12 each.  How much will s shirts and t ties cost?  ____
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Career Connection to Teaching with Technology
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