We worked with numbers to the hundred-thousands.

First, we used base-ten blocks, 10-by-10 grids, and base-ten diagrams to name, write, and represent multi-digit numbers within 1,000,000. We wrote the numbers in expanded form so we can see the value of each digit. Example:

Next, we learned the value of a digit in a multi-digit number is ten times the value of the same digit in the place to its right. Example:

• Both 14,800 and 148,000 have 4 in them.
• The 4 in 14,800 is in the thousands place. Its value is 4,000.
• The 4 in 148,000 is in the ten thousands place. Its value is 40,000.
• The value of the 4 in 148,000 is ten times the value of the 4 in 14,800.

We used both multiplication and division equations to represent this relationship.

Finally, we analyzed the “ten times” relationships by locating numbers on number lines.