Multiplication Of Whole Numbers & Factors Worksheet With Answers - Professor Weissman'S Algebra Classroom Page 3
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12Lesson
How Do I Find The Area Of A Rectangle?
Use the formula Area=LW,
A = LW
Note that the answer includes the
seed a lawn
word square. This is because
to find the area of a rec-
A = (3)(5)
cover a floor, ceiling
when we find the area we are
tangle.
looking for the amount of squares
A = 15 square feet
Review What is the Perimeter of
inside.
the rectangle?
Which side is the length which
3 ft
side is the width.?
P=2L+2W
5 ft
The answer that is doesn‟t
P=2(3)+2(5)
matter, because Multiplication
You‟ll need to find an area when
A rectangle has 4 sides, but
is Commutative.
P=6+10 =16 feet (no squares
you need to
we only use 2 of them to find
it‟s the distance around.
(3)(5)=(5)3)
the Area (A)
paint
Example #1
How many one foot
square tiles are needed to
cover a floor that is 13
feet wide and 20 feet long?
A salesman might say
that the floor is 13 by 20 and
write 13 x 20. The
word by and the symbol „x‟ is
a reminder that for
area you multiply.
A = LW A = (13)(20) =
260 square feet
Since each tile is one square foot, 260 tiles will be needed. It‟s always a
Example #2
The label on a can of paint says that it will 50 square
feet. The wall that will be painted is 8 feet high and
20 cover about feet wide. How many cans will be
needed?
A = LW A=8(20)=160 square feet.
Each can covers 50 square feet. 3 Cans would cover
150 square feet. That‟s not enough. We‟ll need 4
cans. Not to worry, because it‟s a good idea to have
extra paint. Why?
Example #3
Solution.
A rectangular garden 24 feet by 40
a. A=LW A=24(40)=960 sq ft.
feet is being constructed.
b. P=2L+2W
a. How many square feet of sod
P = 2(24)+2(40)
(grass) will be needed?
P = 48+80
b. How many feet of fence will be
P = 128 feet
needed to enclose the garden?
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