2-digit place value challenge

The  exercise appears under the Early math Math Mission. This exercise studies the meaning of the tens place and units or ones place.

Types of Problems
There is one types of problems in this exercise:
 * 1. Which are the same as __?: This problem has a number, and the student is asked to find which other number(s) are equivalent to it.

Strategies
Knowledge of place values through tens is needed. Being able to name numbers under one hundred and understand their names would be an advantage.
 * 1. There may be more than one answer on the problems of this exercise.

Real-life applications

 * 1) Understanding the place value helps to motivate our numbering system as motivated by the Hindu-Arabic numbering tradition.
 * 2) Place value helps to understand other numeration symbols such as the famous Mayan numeration system that received special interest in the year 2012.
 * 3) The abstraction of place value system is related to polynomials that are developed in Algebra I and II.