Front

sum

Back

Answer to an addition problem

Front

difference

Back

Answer to a subtraction problem

Front

product

Back

Answer to a multiplication problem

Front

quotient

Back

Answer to a division problem

Front

digit

Back

One place number in a bigger number

Front

number

Back

A full group of numbers

Front

expression

Back

A number sentence with no equal sign or answer

Front

equation

Back

A number sentence with an equal sign and answer

Front

estimate

Back

An answer that is not exact, close to the real number

Front

variable

Back

A letter that stands in place of an unknown number in a number sentence