Break apart 2-digit addition problems

The  exercise is in the Early math Math Mission. This exercise helps Khan Academy users to learn how to break apart two-digit addition problems.

Types of Problems
There are four types of problem in this exercise:
 * 1. Find the equivalent expression: This problem asks the student to ask which expression could be used to find the value of two two-digit numbers. The student is asked to find the choice that best fits the answer.


 * 2. ''What do we get when we break apart __+__ using place value?
 * 3. Help ___ by choosing an addition problem that is the same as __+__.: This problem features a person who had trouble adding two two-digit numbers, such as $$14+74$$, and the student is asked to help that person find the correct solution.
 * 4. Which of the following is equal to __+__?: This problem has the student add two two-digit numbers, and find the correct choice for the solution.

Strategies

 * 1. There could be regrouping in this exercise, so be prepared to carry some digits.
 * 2. Pay attention to the choices for the answers, as they may be close.

Real-life Applications

 * 1. Knowledge of adding and numbers are essential for algebra and the higher maths.