TT PA 40-43

Chapter 6
Lessons 40-43

Be safe
Be ready
Be kind
Be respectful
Be responsible

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5 star students

Lesson 40

​Measuring 2-D (flat) surfaces

Area of a square or rectangle: length*width

Useful formulas:

You can think of the area of flat surfaces as how many smaller squares fit into them.

What is the area of this square?

What if length and width are different units?

1. Convert your numbers so that BOTH measures are in the same units.

2. Solve as usual.

Multiple Choice

A farmer bought a plot of land measuring 2 on one side and 3.5 miles on the other. How many square miles did he buy?

• 6.5 square miles

• 7 square miles

• 3 square miles

• 3.5 square miles

Multiple Choice

True or false: flat surface areas are measured by how many little squares fit into them.

• true

• false

Area in US Standard (Imperial)

Square inches, square feet, square yards, square miles, and acres are all used to measure area in Imperial or US Standard.

Multiple Choice

Convert feet to yards and calculate the area.

• 36 sq. yds.

• 288 sq. yds.

• 28 sq. yds.

• 32 sq. yds.

Working in Metric

​The procedure is the same, but the units are different.

Multiple Choice

How many square centimeters is this rectangle?

• 950 sq. cm.

• 1000 sq. cm.

• 945 sq. cm.

• 900 sq. cm.

Multiple Choice

Convert the area from square centimeters to meters.

• 9.45

• 94.5

• .945

• .0945

Remember

When converting in metric, all you need to do is move the decimal point left or right. It's easier than imperial.

For square units (area) you multiply or divide by 100 instead of ten when down or up the ladder.

1 sq km = 1,000,000 sq m

Volumes are a calculation of length, width and height.

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Volume

​Calculate the volume of this shape:

What is volume?

​Volume is the measure of how many little cubes will fit into the shape.

Remember to choose BIG units (miles, acres, km, etc. ) for big objects.

Multiple Choice

True or false:

The technical word for 3-D space is "volume"

• true

• false

Multiple Choice

True or false:

3-D space in a box is calculated by multiplying length by width.

• true

• false

Homework

1. Chapter 6, Lessons 40-43