### GoMath Chapter 1

__Important Chapter Vocabulary__1.

**Estimate**; A number close to an exact amount.

2.

**Expanded Form**; A way to write numbers by showing the value of each digit.

3.

**Period**; Each group of three digits separated by commas in a multi-digit number.

4.

**Round**; To replace a number with another number that tells about how many or how much.

5.

**Standard Form**; A way to write numbers by using the digits 0-9 with each digit having a place value.

6.

**Word Form**; A way to write numbers by using words.

**Expanded Form**; 3,000 +500+10+9

**Standard Form**; 3,519

**Word Form**; three thousand, five hundred nineteen