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.

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

### Course: 3rd grade foundations (Eureka Math/EngageNY) >Unit 2

Lesson 3: Topic C: Foundations

# Comparing whole numbers

Sal compares 394 and 397.

## Want to join the conversation?

• Why do people compare numbers and how do they compare numbers?
• You can't really get far in this world without comparing numbers. For example, you need to compare numbers in the grocery store to figure out which item is cheaper. Or, you need to compare numbers to get statistics. Or, you need to compare numbers to see who's older. Comparing numbers is everywhere around us so it's really important to be able to know how. :)

You can use a number line to compare the numbers, but as you grow older and master the basic operation rules (subtraction & addition), you'll know which number is more or less than the other.
• Who created the greater than and less than symbols?
• Thomas Harriot did, in 1621.
• The crocodile will eat the bigger number or smaller number?
• The Crocodile's jaw or the opening of the symbol is towards the greater number closed part is towards the small number.
• Is infinity ever complete or is it just a value constantly moving? What about the number line?
(1 vote)
• Infinity is infact a value that constantly keeps on growing.

Imagine numbers for example, the more zeros you add at the end of a number, the more it grows.

For example, 100, 1000, 100000, 100000000 and so on.
I hope that this helps your situation
• What if the question was like this: Is 300 greater than 250+100 what would we do?
• You should do 250+100 first. If you do it, you get 350. Then compare the numbers, 300<350. Now you know the answer.
(1 vote)
• What would be greater in the case of "-5 ? -14" Is there a lesson on that by the way?
• -5 would be greater. Think of negatives as the opposite of positive/natural numbers. The larger a negative number, the less value it has.
• I am coaching my sister on this math, and is there a good mnemonic 7-year-olds can understand and relate to for place value?