Once students understand rounding to a place value, then they need to be able to reverse their thinking and find which number would round to the answer given when rounded to a given place value. What? Even as I type it I am getting confused. In a place value pre-assessment, students who missed one question or more, 96% of them missed the question related to this concept. That is a huge percentage for one concept that is being more and more frequently presented on tests.
Here is an example:
Which number would round to 4,560,000 when rounded to the ten thousands place:
The answer is C. Did you get it right?
Then a question gets thrown in where they ask the student to pick ALL the right answers to a similar question.
If you are like me and needed something else to present to the students to help them see it in a different way, click the link below for a FREE sort. It has examples and non-examples, or "oddballs," to confirm their understanding of the concept.