##### Across

**1.**number A _____________ is a number that is close to a number but is easy to work with.**4.**When you ____________ addends, you break them apart.

##### Down

**2.**form The representation of a number as a sum of the values of each digit is called ___________.**3.**When you _____________ a number, you find a number that is close to the original number.**5.**You can ___________ an answer when you do not need an exact answer.