Understanding the Place Value System In Grade 5, students must master the relationship between powers of 10 and the position of digits. Whole Numbers: Large numbers are organized into "periods" (Millions, Thousands, Ones), separated by commas.Decimals: The decimal point separates the whole numbers from the fractional parts. The places to the right are the tenths (1/10), hundredths (1/100), and thousandths (1/1000).The Power of 10 Rule Moving Left: Every time a digit moves one place to the left,