Math lesson 4 Multiplying Decimals

Math ch.4
Multiplying Decimals

Go Math 5th Grade

Steps:
1. Line up decimal points
2. Place a zero in missing spots
3. Start left and go right and compare which is bigger

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Comparing Decimals

Multiple Choice

65.8 _____ 65.75

• >

• <

Multiple Choice

10.01 _____ 10.10

• >

• <

The decimal point moves to the left

Multiply by 1, 10, 100, 1000

The decimal point moves to the right

​​Divide by 1, 10, 100, 1000

Multiple Choice

• Multiply by 10

• Divide by 10

Multiple Choice

• Multiply by 1000

• Divide by 1000

Multiple Choice

• Multiply by 10

• Divide by 10

The decimal point moves to the left

Multiply by 1, 10, 100, 1000

The decimal point moves to the right

​​Divide by 1, 10, 100, 1000

Multiple Choice

• 5.697

• 56.97

• 5697

Multiple Choice

• x 0.1

• x 0.01

• x 10

Multiple Choice

• 5.697

• 56.97

• 0.5697

Steps:
1. Stack the numbers
2. Count how many place values it takes to make the decimal into a whole number.
3. Multiply
4. Jump the decimal back in the answer

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Multiply a decimal and a whole number

Steps:
1. Stack the numbers
2. Count how many place values it takes to make both decimals into a whole number.
3. Multiply as usual
4. Jump the decimal back in the answer

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Multiply a decimal and decimal

Let's multiply some decimal math facts

Multiple Choice

• 24

• 2.4

• 0.24

Multiple Choice

• 72

• 7.2

• 0.72

Multiple Choice

• 21

• 2.1

• 0.21

• 0.021

Multiple Choice

• 32

• 3.2

• 0.32

• 0.032

Multiple Select

Pick 2 answers

• 0.2

• 2.0

• 0.20

• 20

Multiple Select

Pick 2 answers

• 10

• 0.10

• 1.0

• 0.1

Multiple Select

Pick 2 answers

• 0.03

• 0.30

• 0.3

• 0.030