Rounding subsequence

Note that Khan Academy has rounding to the nearest 10 or 100 as a 3rd grade topic, rounding to the nearest 10, 100, or 1,000 as a 4th grade topic. It does not include topics on rounding whole numbers beyond thousands. IXL has rounding to the nearest 10 or 100 as a 2nd grade topic. I prefer this, as place value up to and including hundreds is a 2nd grade topic. I like the idea that rounding and place value progress with one another.