


Place Value and Money
Our number system is a placevalue system. This means that each place in a number is assigned a value. The value of each place in the baseten system we use is ten times the value of the place to its right.


Your students learned place value to hundred thousands in Grade 3. See Place Value to 999,999. This year, they will apply placevalue skills to hundred millions. Notice that the places are in groups of three. Each group is called a period. Periods are separated by commas.


The number in the placevalue chart above can be written different ways.
Use the Introducing the Concept lesson Comparing and Ordering Greater Numbers on this Web site to present place value through hundred millions to your students. Then proceed to the Developing the Concept lesson to explore comparing and ordering greater numbers on a placevalue chart. With a solid foundation in place value, students will easily make the transition to comparing numbers without a placevalue chart. Look at the example below. Compare 3,924,761 and 3,915,804. Line up the digits and start with the greatest place value.
3,924,761 > 3,915,804 Students will also rely upon their placevalue skills when they round greater numbers. To round 28,734,115 to the nearest million, find the place you want to round to and look at the digit to its right. 28,734,115 7 > 5, so change 8 to 9 and write zeros to the right. 28,734,115 rounds to 29,000,000. Remember:
The total value of the money is $7.36.
The change is $1.27. Give your students many opportunities to make change. See suggestions in the "Tips and Tricks" section of this topic. 
