The video tutorial teaches how to solve addition word problems using variables. It explains that a variable is a letter representing a number and demonstrates how to define and use variables to write equations for solving problems. Two examples are provided: one involving apples and another involving money, illustrating the process of defining variables, writing equations, and solving for unknowns. The tutorial emphasizes the importance of checking work to ensure correct solutions.

What is a variable in the context of addition word problems?

• A fixed number

• A mathematical operation

• A type of fruit

• A letter representing a number

In the apple problem, what does the variable A represent?

• The number of apples initially owned

• The total number of apples

• The number of apples eaten

• The number of apples given by a friend

How many apples are there in total if you start with 7 and receive 4 more?

• 11

• 12

• 13

• 10

In the money problem, what does the variable D represent?

• The amount of money John lost

• The amount of money John's mom gave him

• The amount of money John saved in all

• The amount of money John spent

How much money does John have in total after receiving an extra $15?

• $35

• $45

• $30

• $40