Compare and Order Numbers

By Risa Udell

“Is Less Than” and “Is Greater Than” Symbols

• We have been writing equations to show that two expressions have the same value.

2 + 3 = 5Or

6 = 4 + 2

“Is Less Than” and “Is Greater Than” Symbols

We’ve also learned symbols for “Equal to” and “Is Not Equal to”

“Is Less Than” and “Is Greater Than” Symbols

Today we’ll learn the symbols for “Is Less Than” and “Is Greater Than”.

“Is Less Than” Symbol

14= 14

Lydia has 14 dollars, and Harry has 14 dollars. The = symbol tells us that the numbers are the same.

“Is Less Than” Symbol

Now, Lydia has 14 dollars, and Harry has 18 dollars.

14

“Is Less Than” Symbol

Now, Lydia has 14 dollars, and Harry has 18 dollars.

14 18

The numbers are not equal anymore.

Which number is less?

“Is Less Than” Symbol

• 14 < 18

small part of symbol

“Is Less Than” Symbol

• What other numbers are “Less Than” 18?

___ < 18

“ _____ is less than 18”

“Is Greater Than” Symbol

Suppose that Lydia has 18 dollars and Harry has 14 dollars.

18 14

Which number is greater?

“Is Greater Than” Symbol

Suppose that Lydia has 18 dollars and Harry has 14 dollars.

18 > 14

“ 18 is greater than 14.”

“Is Greater Than” Symbol

Any comparison can be written in two ways.

15 1212 < 15

12 is less than 1515 > 12

15 is greater than 12

Compare Other Pairs of Numbers

• Write an “is greater than” and “is less than” statement.

Before, After, Between

Write the numbers 1 – 18 on your Math Board.

Write the number that is “just before” 12.

Hold it up.

Before, After, Between

Erase that number.

Write the number that is “just after” 12.

Hold up your board.

Before, After, Between

Erase that number.

Write the number that is “between” 11 and 13.

Hold up your board.

Least to Greatest

• Let’s count from 1 to 10.

Least to Greatest

5 9 3

Are these numbers in order fromleast to greatest?

Greatest to Least

Let’s count backward from 10 to 1.

Greatest to Least

5 9 3

Are these numbers in order from greatest to least?

Great Job Today!