Reteaching
Name
11-5
Area of a Rectangle
You have learned how to multiply fractions by finding the area of a
rectangle.
What is the area of a horse pasture that is _38 mile long by _23 mile
wide?
You can draw the pasture on a 24 × 24 grid.
3
9
_
= __
8
Change each length and width to 24ths.
24
16
2
_
= __
3
24
16
2
_
= __
Area = length × width
3
24
2
_
× _3 =
3
8
16
9
144
__
× __
= ___
24
24
576
144
___
= _1.
576
4
3
9
_
= __
8
24
So, the pasture has an area
of _14 square mile.
For questions 1-2, find each area.
1. a rectangle with sides of lengths _16 yard and _34 yard
2. a square with sides of lengths _25 inch
3. Writing to Explain Is _58 sq. in. a reasonable answer for the
area of a rectangle with lengths of _18 inch by 5 inches?
R 11•5
Copyright © Pearson Education, Inc., or its affiliates. All Rights Reserved. 5