Und rs.t nd Ar

Da n is rra nin th __ at in . reaof- n rt mu __ um. There re · __ ct ions. Each of th ~ct ions is ·, sq u re unit ora,.,, to sho- ., different 'i."• _· oa n ca n i;lrr i;I n .. e the se i;lti n . . ·'Vhi;it is the _re_ of' the Shi;ipe the se i;lti n., m i;I ke s?

0 D~w SF!r,1 pe m i;ide from . uni squi;lres. Coun the unit squ res to fnd the _r~ .

..

.. EE ..

..

Arei;i = 4 squi;l re units

0 Dra'l;•, - d itt-ere nt sha~ m i;I de from 4 uni t squi;lre s.

8=o .. ..

Dud le ·_ d ... in . pl ns fo r _ rden. His dra •,in is 4 un it ~ u_ r~ -3 uni squi;l res. 'Vh t 1s the rei;I of- Dudl •s ~ i;i rden?

0 Mi;ik e i;I ~ del. Count~ unit sq uares to fl nd the ar'e:I.

l 2 ] 4

5 l!i 1

'i1 11;1 11 u

fh Ink: E.loch u nlt:i,qu,u~ haun r 011 sq.gr urtt.

Are = 1 2 sq u re u n rts

0 Use repei;ited i;idd it ion to find the -re .

"

fh Ink: 1h • 3 ra,,,, of '4 I.lit Wlti. 4 4 4 12

Ar'e3 = ·12 sq u re uni

So the rei;I of the , rde n is __ squi;I re uni ts.

(j Dr'a'l;•, third s1; -~ ma:le from · unit squi;lres.

.. .. .. .. ..

..

~ .. ..

"' "' .. +.

Are~ = 4 squ~ re units

(i Use multip li~ t bn to fhd th e rea .

fh Ink : Mu tip If t ngth bf In khh. 3 o-: 4 12

Are = ·12 sq u re uni

The diagram below shows three different ways to find the area of a rectangle:

1) Make a model and count the squares,

2) Make a model and use repeated addition,

3) Make a model and multiply the length by the width.

Remember that the label for area is “square units” (square cm, square in. etc).

15

■-----------------------~~-,..

kl

-~~------------------------■

Perimeter: the distance around the

outsideofashape(thinkofbuilding a

fence all the way around)

P = l + w + l + w

o Add all of the sides together

Measured in units (like cm, in, ft)

Area:theamountofspaceashapecovers

A = b*h or A = l*w

o Multiply the base times height (also called length times width)

Measured in units2 or sq. units (like cm2, in2, ft2)

14 * 8 =

112 cm2

8 cm

5 * 2 =

10 cm2

Sometimes several rectangles are put together to make a unique shape. To find the area, you will need to split the shape back up into rectangular pieces, calculate the area of each, and add the areas together.

Example:

10 cm

5 cm

112 + 10 = 122 cm2

14

cm

16