If you're seeing this message, it means we're having trouble loading external resources on our website.

If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.

### Course: Arithmetic (all content)>Unit 3

Lesson 5: Multiplication by 10s, 100s, and 1000s

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

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

## Want to join the conversation?

• cant you just put a 0 at the end like 8*10=80 i just put a 0 at the end of 8 is that correct
• Yes, that would be correct. Anytime you are multiplying by powers of 10, you simply add the amount of zeros the power of 10 has to the number. For example 23* 1000= 23000. 1000 has 3 zeros so you would just add the 3 zeros to 23.
• i apologize if my question has been asked in the past.
he said, " if i have 1 apple and i multiply it by 0 , shouldn't i still have 1 apple? or how come it disappears?"
• Well, its 1x0 is saying, I have 1 apple per group and I have 0 groups. So how many apples are there? Well, there is 0 because there are no groups.
• I don't get it I don't get like example 6 X blank = 600
• if you already have the sum you just divide, 6 by 600, and get 100, so 100 is your answer. If you don't get that here is an example, 9 X blank = 900, well 9 times 10 is 90 and 9 times 100 is 900 and that is your answer, so the final answer is 100!
• is 3000 = to 3 thousand
• thats correct is very easy
• does anyone know how this works?
• cant you just put a 0 at the end like 8*10=80 i just put a 0 at the end of 8 is that correct
• Yes you can do it that way.
• When I time 10 with a 100 do I add the 0 from ten?
• yeah, it would be a thousand 1000 so I think so
• What is 3*300=?
• 3 * 300 = 300 + 300 + 300 = 900
• um...can you caount by 5 and still get to 100
• Yes indeed! Every number ending with '0' or '5' that is equal to or greater than 5 can be counted to using the number 5.

For example we can go 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100
• all you have to do is multiply a number times 10, 100, or 1000