Directions: Evaluate or solve the following problem. The problem will require three answers:
1) The operation used to solve the problem
2) The reasoning as to why that particular operation was used to solve the problem
3) The answer to the problem
Please make sure to show your work and calculations in order to receive full credit.
Oscar completed 1/3 of his math problems on Monday, and then he finished another 1/2 on Tuesday. What fraction of the math problems had he finished by the end of Tuesday?