Chapter 1: Use Place Value to Represent Whole Numbers

Chapter Overview:

During this chapter, students learn to:

• Read and write whole numbers through the millions.
• Compare and order whole numbers through the millions.
• Round whole numbers through the millions.

Chapter 1 Vocabulary:

digit: A symbol used to write numbers.  The ten digits are 0, 1, 2, 3, 4, 5, 6, 7, 8, 9.

estimate: A number close to an exact value; an estimate indicates about how much.  Example: 47+22 (estimate 50 + 20) about 70

expanded form: The representation of a number as a sum that shows the value of each digit.  Example: 536 could be written as 500 + 30 + 6.

is equal to (=): Having the same value.

is greater than (>): The number on the left of the symbol is greater than the number on the right.  Example: 5 > 3 (5 is greater than 3.)

is less than (<): The number on the left of the symbol is less than the number on the right.  Example: 4 < 7 (4 is less than 7.)

place value: The value given to a digit by its position in a number.

rounding (or round): To find the nearest value of a number based on a given place value.  To change the value of a number to one that is easier to work with.

standard form: The usual way of writing a number that shows only its digits, no words.