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## 3rd grade foundations (Eureka Math/EngageNY)

### Course: 3rd grade foundations (Eureka Math/EngageNY) >Unit 3

Lesson 3: Topic F: Foundations

# Intro to place value

Sal uses the number 37 to explain why we use a "ones place" and a "tens place" when writing numbers.  Created by Sal Khan.

## Want to join the conversation?

• If you just wanted to group scratches of ten together, wouldn't you leave the ones still as scratches but just change the tens to something else? Maybe an X? So it'd be `XXXIIIIIII` for thirty-seven?
• Yes, and that's essentially what Sal did, but using our already known number notation. We could call `XXXIIIIIII´: 3 X and 7 I. However, we know X represents ten I, so we call it "ten". If we have three of those tens, we join the words in a funny way and call it "thirty", then we are still left with 7 ones, which we just call seven. To join our thirty and seven we just call thirty seven (37).
• but what if the ten is in a hunderd
• Than it equals 110
• i need help and i am 5 yeas old
• Dude, if you need help I'm the guy. I am a 6th-grade prodigy. what do you need help with?
• Did you split the numbers
• You mean like split a number into place value? Well we could say 245 could be 2 hundreds, 4 tens, and 5 ones. You could say 200 + 40 + 5. You start at the ones place. 245 ones place would be 5. Then the tens, etc. 245 4 tens 2 hundreds. 5642576 = 5 millions, 6 hundred thousands, 4 ten thousands, 2 thousands, 5 hundreds, 7 tens, 6 ones. Try some more in the practice quizzes!
• SUP yall who nose what 3x3x3x8x8x9x9x0x0x2322
• do I get points for watching the videos
• yes you get 750 points per video no matter the length
• How could you become really proficient in place value?
• Practice and repetition will help a lot.
If you understand the idea of place value, you will succeed!
• and i no mulltmcashon like 2 times 4.A statad to use is conting by twos 4 times! ;)