Chapter 3 Lesson 1 Using a Ruler

Chapter 3 Lesson 1 Using a Ruler

We ONLY USE the centimeter side, WHY?

• scientists use the centimeter ruler when measuring

• this ensures that we are using the metric system which is universally accepted

• Makes sure that our results are valid, and not miscalculated by going from the US imperial/customary system to metric.

Multiple Choice

Looking at the picture, which side is the metric side?

• top

• bottom

Ruler Information!

• centimeter rulers are made up of cm and mm

• mm are the tiny lines between the cm's

• cm usually have a number under them

Multiple Choice

To determine which side is the centimeter side, you can count the number of lines between the numbers.

• True

• False

Multiple Choice

How many mm are in-between each cm?

• 1

• 10

• 100

• 100

Using the Ruler

• Place the object at the edge of the ruler. It should line up with the large cm line

• Determine the nearest mark at the opposite edge of the object. It is does not line up to the whole number, then count the little lines.

• Your answer will be in the form of a decimal. The whole number will come first, then the decimal point followed by the number of millimeters.

Multiple Choice

Looking at my/your ruler, where do I start measuring?

• at the beginning of the ruler

• at the 0 centimeters

• wherever I want

Multiple Choice

When measuring with a centimeter ruler, your answers should be written in decimal form.

• True

• False

Let's Practice!

Dont overthink this one :)

Multiple Choice

How many cm is the pencil?

• 7.1 cm

• 7.2 cm

• 6.5 cm

• 7 cm

Multiple Choice

How many cm is the butterfly?

• 1.85 cm

• 1.5 cm

• 1.8 cm

• 2 cm

Multiple Choice

How long is the leaf?

• 6.2 cm

• 6.3 cm

• 6.4 cm

• 6 cm