Multiplying Decimals (2.5)

Multiplying Decimals (2.5)

Follow along in your math notebook!

Multiple Choice

When multiplying decimals, do we line up the decimal?

• yes

• no

• maybe so?

Multiple Choice

Evaluate 9 • 12.37

• 1.1133

• 11.133

• 111.33

• 1113.3

Open Ended

Could you have done the previous problem (9 • 12.37) by just looking at the answer options??

The answers were:

1.1133

11.133

111.33

1113.3

Explain...

Open Ended

Could you have done the problem (9• 12.37) by estimating the answer? Explain...

Multiple Choice

Try another one...

4.68 • 2.6

• 1.2168

• 12.168

• 121.68

• 1216.8

Multiple Choice

Place the decimal point in the product...

1.78 x 4.9 = 8722

• 0.8722

• 8.722

• 87.22

• 972.2

Open Ended

Is the product 1.23 x 8 greater than or less than 8? Explain...

Example 4 Modeling Real Life

A science teacher buys 3.25 ounces of zinc for an experiment. The zinc costs $2.41 per ounce. The teacher pays with a $10 bill. How much change does the teacher receive?

Poll

How ready are you for multiplying decimals on your quiz tomorrow??

• I feel great, I think I am ready for the quiz :)

• I feel okay, I might need a little extra practice.

• I don't feel ready and I need to do more practice.