Commutative Property

Identity Property of Addition

Associative Property of Addition

addends

sum

round

ABOUT how many or how much.

Closest number ending with 0.

estimate

To give a number or answer that tells about how many or how much.

compatible numbers

Numbers that are easy to add, subtract, multiply, or divide mentally.

fact family

a group of related facts using the same numbers

difference

The answer to a subtraction problem.

equivalent

equal to

compute

expanded form

inverse operations

Two operations that are the opposite of each other.

compensation

adding and subtracting the same number to make the sum or difference easier to find

numerator

standard form

a way to write a number only showing its digits

Example: 385

denominator

word form

a number written in words

four thousand, six hundred, thirty two

base 10 place value

the value of the place a digit has in a number

digits

the symbols 0, 1, 2, 3, 4, 5, 6, 7, 8,and 9, used to write numbers

compare

to find out which number is greater and which number is less

ordinal number

a number used to show the order of people or objects

decimal point

a dot that separates dollars from cents and ones from tenths in a number

Example: $1.95, 1.9

integers

array

skip count

set

subset

whole numbers

no fraction, no decimals, no negatives

at least

as much as, equal to or greater than

at most

no more than, equal to or less than

factor

a whole number that multiplies with another number to make a third number

fraction

any part of a group, number or whole

Fractions have a numerator and a denominator

greater than

less than

mixed number

a whole number and a fraction

model

...

multiplication

an mathematical operation where a number is added to itself several times

division

a math operation where a number is shared or grouped into equal parts

addition

a math operation where 2 or more groups are combined

45 + 13 = 58

subtraction

a math operation that takes one quantity away from another

63 - 19 = 44

number sentence

a mathematical sentence using symbols and numbers

an equation or a inequality with <, >, or =

2 + 3 = 5

1 + 3 > 2

8 - 2 < 7

place value

the value of a digit depending on its place in a number

reasonable

an answer that makes sense

regrouping

carrying in addition and borrowing in subtraction

sharing equally

fair share, dividing so that each group is equal

classify

to make a group based on similar characteristics

order

arranged according to size, amount or value

distributive property

6 x 27 =

breaking apart multiplication problems into similar problems