North Carolina Standard Course of Study
NC.5.NBT. Number and Operations in Base Ten
Understand the place value system.
NC.5.NBT.1. Explain the patterns in the place value system from one million to the thousandths place.
NC.5.NBT.1.a. Explain that in a multi-digit number, a digit in one place represents 10 times as much as it represents in the place to its right and 1/10 of what it represents in the place to its left.