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### Course: 5th grade foundations (Eureka Math/EngageNY) >Unit 1

Lesson 5: Topic E: Foundations

# 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
• 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
• does anyone know how this works?
• What is 3*300=?
• 3 * 300 = 300 + 300 + 300 = 900
• um...can you caount by 5 and still get to 100