Understand the place value system.
a. Read and write decimals to thousandths using base-ten numerals, number names, and expanded
form, e.g., 347.392 = 3 × 100 + 4 × 10 + 7 × 1 + 3 × (1/10) + 9 × (1/100) + 2 × (1/1000).
(5.NBT.3a)
More information and the complete College and Career Readiness Standards can be found here.