I created this simple worksheet to help my 2nd graders understand rounding to the nearest 10. It worked so well that 17 of the 18 students understood and could round any number by the end of the first lesson. A couple of kids did have to be reminded to round the 5 UP once or twice but other than that I was painlessly able to teach rounding. The students like rounding so much they BEG me to give them more.
I have included one sheet with numbers already filled in and one sheet that you can use to input any numbers before making copies.