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### Course: Arithmetic>Unit 5

Lesson 5: How 10 relates to place value

# Place value when multiplying and dividing by 10

Lindsay discusses how multiplying and dividing by 10 affects place value.

## Want to join the conversation?

• If you multiply 10 x 9 you add a zero
Why don't you get 90 when the problem is 9 x 0
• What she meant when she said "if you multiply 10 x 9 you add a zero," what she meant was you add a zero to the answer you got. because 10 x 9 = 90. see? there is a zero at the end! :3
• when we multiply a number by 5 , the number has __ or __ in the one place.
• Like skip counting by 5 like 5 10 15 20 26 30 35 40 45 50 55 60 you can go to 100 65 70 75 80 85 90 95 100
• If you just divide a number by ten and it has zeros, take out a zero. Very easy
• right! just remember that the zeroes you take out have to be at the end, like 100, not 101
• hi can i get an explantion because i didn't get it at all!
• When you have a number like 100 and you divid it by 10 you take one of the zeros away. 10. Same for multiplying but you add a zero
• how can you multiply a decimal?
• Multiplication of decimals is same as integers for example 7.96*6.8 = 54.128 we kept decimal after 3 digits because in 7.96 there are 2 digits after decimal and in 6.8 there is one digit after decimal total 3 digits. so, after multiplying we have to keep decimal after 3 digits from left side.
• Did we not learn this before the last video? (Not including lessons)