Rounding to the nearest 10 Activity 1: Write the price of each of the following musical instruments to the nearest 10 dollars. Remember the rules of rounding numbers to the nearest 10; If the number that you are rounding is followed by 0, 1, 2, 3, or 4, round the number down. If the number that you are rounding is followed by 5, 6, 7, 8, or 9, round the number up. Enjoy this rounding to the nearest 10 activity by rounding up or rounding down to the nearest 10.