Mastering Decimal Multiplication Techniques

This video lesson by Kirk Weiler from eMathInstruction covers Unit 3, Lesson 3 on multiplying decimals. It begins with an introduction to the challenges of multiplying decimals compared to addition and subtraction. The lesson includes exercises on multiplying by 10, dividing by powers of 10, and converting decimals to fractions for multiplication. The standard method for multiplying decimals is explained, and common misconceptions are addressed. The lesson concludes with practice problems and a summary of key points.

What is the main focus of this lesson?

• Dividing decimals

• Subtracting decimals

• Multiplying decimals

• Adding decimals

What happens to the decimal point when you multiply a number by 10?

• It is removed

• It moves one place to the right

• It moves one place to the left

• It stays the same

How many decimal places will the product of 0.3 and 0.7 have?

• Four

• Three

• Two

• One

What is 0.24 written as a fraction with a power of ten in the denominator?

• 24/1

• 24/1000

• 24/100

• 24/10

If Matt believes that 0.3 times 0.2 equals 0.6, is he correct?

• Yes, because 0.3 times 0.2 is 0.6

• No, because 0.3 times 0.2 is 0.06

• Yes, because multiplying decimals always results in a larger number

• No, because 0.3 times 0.2 is 0.03

What is the product of 0.7 and 0.2 using the standard method?

• 0.004

• 0.07

• 0.14

• 0.02

How many decimal places should the product of 0.85 and 0.02 have?

• Two

• Three

• One

• Four

What is the product of 5.2 and 0.5?

• 2.6

• 26

• 0.26

• 0.052

What is the product of 2.6 and 6.7?

• 174.2

• 17.42

• 0.1742

• 1.742

What is the final answer for 385 times 26 with four decimal places?

• 100.10

• 10.010

• 1.0010

• 10010