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standard form of a number

the "regular" way to write a number using only digits

expanded form of a number

an addition problem showing the value of each digit of a number

value of a digit

the worth of a digit because of the place in which it is located in a number

digit

the individual numbers used to form a number

place value

the position in which a digit is written in a number

addends

the numbers added together in an addition problem

sum

the answer to an addition problem

difference

the answer to a subtraction problem difference