4th grade warmup

The exercise 4th grade warmup is a topic under the 4th grade (U.S.) Math Mission. This exercise reviews concepts from 3rd grade.

Types of Problems
There are thirteen types of problems in this exercise:
 * 1) Round: This problem shows the mass of a chick, and asks the user to round to the nearest hundred.
 * 2) Add: This problem asks the user to add two three-digit numbers.
 * 3) Subtract: This problem asks the user to subtract two three-digit numbers.
 * 4) Which number makes this equation true?: This problem shows an addition equation, and asks the user what addend makes the equation true.Screen Shot 2015-12-26 at 11.49.24 AM.png