Add within 20

The first instance of the Addition within 20 exercise is under the Early Math Math Mission. This exercise practices basic addition facts up to a total sum of twenty.

Types of problems
There is one type of problem that shows up in this exercise:
 * 1) Add the numbers: An addition problem is given and the student is asked to provide the answer.Addin20.png

Strategies
This problem is easy to get both accuracy and speed badges since the problem involved has fairly small numbers and there is only one of them.