Understanding Decimal Operations and Place Value

This lesson teaches how to multiply and divide by multiples of ten by moving the decimal point. It reviews the base 10 system and explains how to use place value charts for multiplication and division. The lesson also covers how to move the decimal point to achieve the same results without using a place value chart.

What is a characteristic of multiples of ten?

• They are prime numbers.

• They end in 5.

• They are divisible by 2.

• They end in 0.

What does 'deci' in the decimal system mean?

• 5

• 10

• 100

• 1000

How do you multiply a number by 10 using a place value chart?

• Subtract a zero from the end.

• Add a zero at the end.

• Move each digit one column to the left.

• Move each digit one column to the right.

When multiplying by 100, how many columns do you move each digit to the left?

• One column

• Two columns

• Three columns

• Four columns

What is the result of moving the decimal point one place to the right?

• The number is divided by 10.

• The number is multiplied by 10.

• The number is divided by 100.

• The number is multiplied by 100.

How do you divide a number by 10 using a place value chart?

• Subtract a zero from the end.

• Move each digit one column to the left.

• Move each digit one column to the right.

• Add a zero at the end.

When dividing by 100, how many columns do you move each digit to the right?

• One column

• Four columns

• Three columns

• Two columns

What happens when you move the decimal point two places to the left?

• The number is multiplied by 100.

• The number is divided by 100.

• The number is multiplied by 10.

• The number is divided by 10.

What is a common misunderstanding when dividing by a larger number?

• Thinking the decimal point doesn't move.

• Thinking the process is different.

• Thinking the result will be smaller.

• Thinking the result will be larger.

How many places do you move the decimal point to divide by 1000?

• Four places

• Three places

• One place

• Two places