Multiply by Multiples of Ten micro-lesson

Chris Lindsey

Maths

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Learning time

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When you multiply with multiples of 10, remember, it's all about the facts. For example, if you take 4 x 30, you can use the fact 4 x 3 which is 12 and then tack on one zero for 120. You can also do it with multiples of 100. 4 x 300 is the same fact, 12. This time you tack on two zeros, 1, 2, 1,200 or 1,200. And you can even do it with multiples of 1,000. Same facts, 4 x 3. Only this time, you tack on three zeros, 12,000. Let's try another one, 70 x 30. Remember, it's all about the facts. 7 x 3 is 21 and you have a zero from the 70 and a zero from the 30. So, I tack on two zeros and my answer is 2,100. So, remember, whenever you want to multiply with multiples of 10, 100, or 1,000 it's all about the facts.

Answer time

Kids earn more screen time by answering fun educational questions.

Here are some example of questions about this video that kids may be asked in the 1Question app to earn screen time.

How many zeroes will the product of 4 x 300 have?

1) 2

2) 1

3) 3

4) 4
How many zeroes will the product of 70 x 30 have?

1) 2

2) 1

3) 3

4) 4
If you multiply 20 x 5, how many total zeroes will your product have?

1) 2

2) 1

3) 3

4) 0
How many total zeroes will the product of 40 x 200 have?

1) 3

2) 2

3) 4

4) 5
How many total zeroes will the product of 80 x 50 have?

1) 3

2) 2

3) 4

4) 1
How many total zeroes will the product of 50 x 600 have?

1) 4

2) 3

3) 2

4) 5
Gia's case holds 12 jars. How many jars will 10 cases hold?

1) 120

2) 12

3) 1200

4) 22
Multiply 17 x 10.

1) 170

2) 27

3) 17

4) 1700
What factor do you multiply by 70 to equal 210?

1) 3

2) 30

3) 300

4) 3000
What factor do you multiply by 2 to equal 800?

1) 400

2) 40

3) 4

4) 16
Multiply 80 x 30.

1) 2400

2) 240

3) 110

4) 24000
What is 4 x 3,000?

1) 12000

2) 1200

3) 11000

4) 43000
What is 4 x 4,000?

1) 16000

2) 1600

3) 44000

4) 12000
Multiply 3 x 9,000.

1) 27000

2) 2700

3) 24000

4) 29000
Complete the pattern: 6 x 3 + 18 6 x 30 = 180 6 x 300 = __

1) 1800

2) 18000

3) 180

4) 18
What is 3 x 7000?

1) 21000

2) 20000

3) 19000

4) 22000
What is 900 x 70?

1) 63000

2) 62000

3) 6300

4) 67000
What is 300 x 30?

1) 9000

2) 90000

3) 900

4) 90
What is the multiplication fact that helps you find 4 x 30?

1) 4 x 3

2) 4 x 10

3) 3 x 40

4) 10 x 3
What is 9 x 50?

1) 450

2) 4, 500

3) 950

4) 400
Sally's ribbon is 30 inches. Lisa has a ribbon 5 times that long. How long is Lisa's ribbon?

1) 150 inches

2) 50 inches

3) 15 inches

4) 35 inches
Which fact can help you solve 70 x 30?

1) 7 x 3

2) 7 x 10

3) 3 x 10

4) 7 x 0
Which fact can best help you solve 70 x 80?

1) 7 x 8

2) 7 x 10

3) 8 x 10

4) 10 x 80
If you multiply 7 x 60, is the product greater than or less than 400?

1) greater than

2) less than
Is the product of 200 x 50 equal to 1,000?

1) No

2) Yes

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Chris Lindsey

Elementary Teacher in South Carolina, USA. I have been teaching 4th and 5th grades for the past 11 years. My passion is teaching Math, but my love is reading aloud to children.

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