Rounding whole numbers 2

The  exercise appears under the 4th grade (U.S.) Math Mission. This exercise practices rounding whole numbers.

Types of problems
There are three types of problems in this exercise:
 * 1) Round ___ to each of the following place values.: This problem has a number that is at least three digits and user is asked to round three place values of the number.
 * 2) Write a whole number that rounds to ___ if we are rounding to the nearest ___ .: This problem asks the user to type a whole number that rounds to ___ while rounding to the nearest ___.
 * 3) Which of the following digits could replace the □ in the tens place to make this statement true?: This problem has an explanation such as 83□5 rounds to 8370 if we round to the nearest ten, and user is asked to find which digit(s) could replace the □. There may be more than one answer to this type of problem.

Strategies
Basic knowledge of addition is required for this exercise.
 * 1) If a number is below 5, it is rounded down.
 * 2) If a number is above 5, it is rounded up.

Real-life Applications

 * 1) Decimals are used to measure the magnitude of earthquakes (the Richter Scale).