Unit 4 Math Review

Math Review

Unit 4

When measuring do not forget to line up the line segment to the zero. Always

Tally Chart

The data in the tally chart tells the lengths of the butterflies as well as the number of butterflies that were measured.

Line Plot

The line plot shows a visual in Xs of the butterflies that were measured. Each X represents one butterfly.

Poll

How many butterflies measure at 2 and a half inches?

• 4 butterflies

• 5 butterflies

Poll

How many butterflies measure at 3 inches?

• 1 butterfly

• 2 butterflies

Polygons

A polygon is a flat figure with straight and closed sides. The polygons in the circle have two sets of parallel line.

Poll

A rectangle is considered a polygon?

• Yes

• No

Poll

6 times 4 equals...

• 10

• 24

Perimeter

• Side + Side + Side + Side

• Make sure to add up all of the sides carefully.

• If only one side is given, think about the shape and how many sides it has.

Poll

What is the perimeter of the hexagon shown in the picture?

• 18

• 18 feet

Area

• Area is measured in squared units.

• To find the area make sure to multiply the length of the shape by the width.

• You can also add up (count all) the squares units inside of the shape.

Poll

What is the area of the rectangle in the picture?

• 21

• 21 squared units

Find the area and perimeter of the shape.

Perimeter: Add up all of the sides

Area: Multiply the length x width

Think about it: Do you agree with Jonah? Why or why not?

Rectilinear Shape 

Sometimes you are given a shape that can be partitioned into smaller rectangles. To find the area make sure to partition the shape and find the area of the smaller rectangles first. Once you have found the area of the smaller shapes add the two up to get the area of the entire shape.