How much is 210 rounded to the nearest ten?

When rounding a number to the nearest ten, you focus on the digit in the ones place. In the case of 210, the number is made up of two digits, where the last digit (the ones place) is 0. According to rounding rules, if this ones digit is less than 5, you round down to the nearest ten.

Here, since the digit in the ones place is 0, you remain at the original ten value of 210 rather than rounding up or down. Therefore, 210 rounded to the nearest ten is simply 210 itself. This understanding of rounding rules is crucial, particularly recognizing how the digit in the ones place affects the final rounded value.