Select strategies for adding within 100

The  exercise is in the Early math Math Mission. This exercise helps Khan Academy users to find strategies for adding numbers within 100.

Types of Problems
There is one type of problem in this exercise:
 * 1) Select any strategy that can be used to add __ + __: This problem has two two-digit numbers and the user is asked to find strategy/stategies that can be used for adding them.

Strategies
Knowledge of adding two-digit numbers without regrouping is essential to ensure success while doing this exercise.
 * 1) There may be more than one correct answer in this exercise.
 * 2) There is can regrouping in this exercise, user should be prepared to carry digits.

Real-life Applications

 * 1) Problems like this will appear on standardized tests like the SATs.