| A | B |
| decimal | a number with one or more digits to the right of the decimal point |
| tenth | one of ten equal parts |
| estimate | to find a number that is close to an exact amount |
| variable | a letter or symbol that stands for one or more numbers |
| ten-thousandth | one of ten thousand equal parts |
| Commutative Property | the property that states when the order of two addends is changed, the sum is the same |
| Associative Property | the property that states when the grouping of addends is changed, the sum is the same |
| hundredth | one of one hundred equal parts |
| thousandth | one of one thousand equal parts |
| expression | a mathematical phrase or the part of a number sentence that combines numbers, operation signs, and sometimes variables, but doesn't have an equal sign |
| mixed number | a number represented by a whole number and a fraction |
| equivalent decimals | decimals that name the same number or amount |