| A | B |
| estimate | To find an answer that is close to the exact amount. |
| round | To replace a number with another number that tells about how many or how much |
| equation | a number sentence with an equal sign to show that two amounts are equal |
| difference | an answer to a subtraction problem |
| greater | more, or more than another number |
| less | a smaller amount, or smaller than another number |
| inequality | NOT equal |
| sum | the answer to an addition problem |
| quotient | The number, not including the remainder, that results from dividing |
| product | the answer to a multiplication problem |
| remainder | The amount left over when a number cannot be divided equally |
| digit | Any one of the ten symbols 0, 1, 2, 3, 4, 5, 6, 7, 8, or 9 used to write numbers |
| addend | a number that is added to another in an addition problem |
| regroup | To exchange amounts of equal value to rename a number |
| standard form | A way to write numbers by using digits |
| expanded form | A way to write numbers by showing the value of each digit |
| word form | A way to write numbers by using words |
| about how many | words that tell you that you can estimate the answer |
| multiple | a number that is the product of two numbers |
| factor | a number that is mulitplied by another number to find a product |