Fractions, Number Lines, and Order

Solving a Word Problem Using a Bar Diagram

We may use bar diagrams to help solve some types of problems. For example, use a bar diagram to solve the following problem:

Missy had $45.  She spentof her money on a book.  How much money does she have left?

Solution: The answer to the question, "What is  of $45?" gives us the amount she spent. The amount she has left would be the amount left after the amount she spent is removed.

We have that 1 unit is $9. So, 2 units would be $18 and 3 units would be $27.

Missy has $27 left after spending $18 of her $45.

 

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