Solving Word Problems with Variables

This lesson teaches how to solve addition word problems using variables. It explains that a variable is a letter representing an unknown number and demonstrates how to define and use variables in equations. The lesson includes examples, such as calculating the total number of apples and determining the total money saved by John. By defining variables and writing equations, students can solve for unknown values in word problems.

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

• A fixed number

• A letter representing a number

• A type of fruit

• A mathematical operation

In the apple problem, what does the letter 'a' represent?

• The number of apples I started with

• The number of apples my friend has

• The number of apples I have in total

• The number of apples I gave away

How do you define a variable in a word problem?

• By guessing the answer

• By solving the equation first

• By stating what the letter represents

• By using a random letter

What is the total number of apples in the apple problem?

• 11

• 4

• 10

• 7

In the money problem, what is the first step to solve it?

• Calculate the total amount

• Define the variable

• Write the final answer

• Subtract the amounts

What does the letter 'd' represent in the money problem?

• The amount of money John spent

• The amount of money John saved in all

• The amount of money John's mom has

• The amount of money John started with

How much money did John save in total?

• 5 dollars

• 35 dollars

• 15 dollars

• 20 dollars

Why is it important to check your work after solving a word problem?

• To ensure the variable is defined

• To rewrite the problem

• To find a new variable

• To verify the equation is correct

What is the equation used to solve the money problem?

• 20 - 15 = d

• 20 + 15 = d

• d - 15 = 20

• 15 + d = 20

What clue in the money problem indicates it is an addition problem?

• The word 'in all'

• The word 'multiply'

• The word 'subtract'

• The word 'divide'