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### Course: Arithmetic>Unit 7

Lesson 1: Multiplication by 10s, 100s, and 1000s

# Multiplying 1-digit numbers by multiples of 10, 100, and 1000

Lindsay finds a pattern from multiplying 1-digit numbers by multiples of 10, 100, and 1000.

## Want to join the conversation?

• Can you just times 4x8 first then add the zero at the end?
• if its 40*8 or 80*4 you could
• 7x100= 700 so on and so on
• Just tell your friends that if you have 7x10 it will be 70 however many zeroes there are just add them to the number like 7x10=70 7x100=700 7x1000=7000 hope this helps them
• What about 100000000 is it still like that?
• Yes you can even get to the tillions.
• After so many days of practicing it feels really easy to do all these question, I can now finish exircises in seconds. (my highscore 13.72 secs)
• nice :D
• whats 1 million times 1 million
• (EDIT: This was a response to a commenter asking what a trillion was. The user seemed to have deleted their comment)

Hey,

because million has six zeros, we just add 6 zeros and 6 zeros and get million of millions also know as "trillion".

Trillion looks like this:
1,000,000,000,000.

For imagination:
One million seconds (1 000 000 s) is about a week and half.

One trillion seconds is about 31 709 YEARS.

Try guessing what was happening about 30 000 years ago - The ice age was about to end.

Hope this helps.
• What makes me still confused is that one-thousand is 1 and three 0s and then decimal point (1000.), while one-thousandth is decimal point, only two (but not three) 0s and 1 (.001).
• This is a good observation. This slight difference in the number of 0’s happens, because the units place is just to the left of the decimal point instead of at the decimal point.
• her voice it is like song for me
• what are you talking about? this is math not a chatroom