Addition is an operation that finds the total number when two or more numbers are put together.

In other words, addition is the process to find the sum of two or more numbers.

3 and 4 add up to give 7.
50 and 50 add up to give 100.

#### Choices:

A. 149
B. 139
C. 147
D. 150
Sam has $5 in one pocket and$7 in another pocket. He wants to buy a book that costs \$13. He would immediately add the amounts to check if he has enough money to buy the book.