Math Vocabulary
Topic 1 -- Numeration
Lesson 1-1 Hundreds
digits - All numbers are made from the digits, 0,1,2,3,4,5,6,7,7,& 9.
place value - Place value is the value of the place a digit has in a number.
(Example: In the number 246, the value of 4 is 40.)
standard form - A number written in a way that shows only its digits.
( Example: 125 )
expanded form - A number written as the sum of the values of its digits.
( Example: 100 + 20 + 5 )
word form - A number written in words.
( Example: One hundred twenty-five )
Lesson 1-3 Greater Numbers
period - A period is a group of 3 digits in a number, starting from the
right. Two periods are separated by a comma.
Example: 241,904 - 241 is in the thousands period.
904 is in the hundreds period.
Lesson 1-4 Ways to Name Numbers
ordinal number - An ordinal number is used to show the order of people
or objects.
* # $ % @
1st 2nd 3rd 4th 5th
first second third fourth fifth
Ordinal Number: 4th
Ordinal Word Form: fourth
The percent sign is fourth.
Lesson 1-5 Comparing Numbers
compare - When you compare two numbers you find out which number is
greater and which number is less.
Symbol Meaning Example
< is less 151 < 154
than
> is greater 154 > 151
than
= is equal 151 = 151
to
Lesson 1-6 Ordering Numbers
order - When you order numbers, you write them from greatest to least or
from least to greatest.
947 479 794
Ordered from least to greatest: 479 794 947
Ordered from greatest to least: 947 794 479
Lesson 1-7 Counting Money
dollar sign - A dollar sign shows money amounts. ( $ )
The dollar sign is written in the front of the money
amount. $4.75
decimal point - A decimal point separates dollars and cents. ( . )
$4.75
Lesson 1-1 Hundreds
digits - All numbers are made from the digits, 0,1,2,3,4,5,6,7,7,& 9.
place value - Place value is the value of the place a digit has in a number.
(Example: In the number 246, the value of 4 is 40.)
standard form - A number written in a way that shows only its digits.
( Example: 125 )
expanded form - A number written as the sum of the values of its digits.
( Example: 100 + 20 + 5 )
word form - A number written in words.
( Example: One hundred twenty-five )
Lesson 1-3 Greater Numbers
period - A period is a group of 3 digits in a number, starting from the
right. Two periods are separated by a comma.
Example: 241,904 - 241 is in the thousands period.
904 is in the hundreds period.
Lesson 1-4 Ways to Name Numbers
ordinal number - An ordinal number is used to show the order of people
or objects.
* # $ % @
1st 2nd 3rd 4th 5th
first second third fourth fifth
Ordinal Number: 4th
Ordinal Word Form: fourth
The percent sign is fourth.
Lesson 1-5 Comparing Numbers
compare - When you compare two numbers you find out which number is
greater and which number is less.
Symbol Meaning Example
< is less 151 < 154
than
> is greater 154 > 151
than
= is equal 151 = 151
to
Lesson 1-6 Ordering Numbers
order - When you order numbers, you write them from greatest to least or
from least to greatest.
947 479 794
Ordered from least to greatest: 479 794 947
Ordered from greatest to least: 947 794 479
Lesson 1-7 Counting Money
dollar sign - A dollar sign shows money amounts. ( $ )
The dollar sign is written in the front of the money
amount. $4.75
decimal point - A decimal point separates dollars and cents. ( . )
$4.75