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welcome to math with mr. jet in this

video we're going to be discussing area

and specifically how to find or

calculate area of rectangles and the

area is the measure of space inside of a

shape and that's up top for you to

reference there and then blue up top we

have area equals length times width

that's the formula we're going to use to

calculate area so as you can see there

are four problems on your screen that

we're going to go through in order to

learn more about finding area of

rectangles so let's jump right in to

number one so for number one we have a

four by five inch rectangle so the first

thing we need to do in our calculating

area problem here we write out our

formula so area equals length times

width next we need to plug in our length

and width I'm going to use the four

inches for the length and the five

inches for the width now if you flip

those and you use five for the length

and four for the width that's fine

you'll get the same answer either way so

after we plug in we solve in order to

calculate the area so four times five

gives us 20 now look back at the

original problem to see which unit of

measure we used and it was inches so we

have 20 inches and we put a little two

up here for area and that tells us that

the rectangle has an area of 20 square

inches and I did something so we can

kind of visualize what those 20 square

inches look like that cover or fill that

rectangle so we have four inches going

across so I put four squares going

across and we have five inches going

down so one

three four five now we're all those

lines intersect and create those squares

we have a four by five rectangle and

there are twenty squares that fill or

cover that rectangle now it's much

easier and quicker to just do four times

five and follow our formula then fill a

rectangle with all those squares but

this kind of shows us what those 20

square inches look like that fill that

rectangle let's take a look at number

two so we write out our formula first

area equals length times width

next we plug in now this is a little

different than number one because we

have all sides the measurements listed

do not just multiply everything for an

area problem you have to pick out the

correct length and width if you just

multiply everything you're not going to

get the correct answer I'm going to use

15 feet for the length times 4 feet for

the width 15 times 4 equals 60 square

feet and that's going to be our answer

for the area 2 number 2 so let's take a

look at number 3 right out of our

formula first area equals length times

width plug in I'm going to use 25 for

the length times 10 for the width solve

to find our area 25 times 10 equals 250

and that is square centimeters so area

equals 250 square centimeters so for

number 4 we have a word problem where

we're going to need to calculate area so

a rectangular living room has a width of

10 yards and a length of 8 yards what is

the area of the living room so first

step we need

to write out the formula area equals

length times width then we need to plug

in length of eight yards times width of

ten and then solve so eight times ten

the area equals eighty and then this is

square yards

so area equals eighty square yards again

area equals length times width and it's

the measure of space inside a shape now

this video we did specifically

rectangles now hopefully this helped

it's your turn to try some on your own

over at the mastery check I dropped that

link down in the description thanks so

much for watching until next time peace