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Comparison Word Problems




 
In these lessons, we will learn how to solve comparison word problems using either bar models or comparison bars.

Related Topics:
More Word Problems, Algebra Word Problems

We will look at three types of comparison word problems.

Difference Unknown
Connie has 15 red marbles and 28 blue marbles. How many more blue marbles than red marbles does Connie have?
This is a subtraction problem.
28 - 15 = 13

Unknown Big Quantity
Connie has 15 red marbles and some blue marbles. She has 13 more blue marbles than red ones. How many blue marbles does Connie have?
This is an addition problem.
15 + 13 = 28

Unknown Small Quantity
Connie has 28 blue marbles. She has 13 more blue marbles than red ones. How many red marbles does Connie have?
This is a subtraction problem.
28 -13 = 15

Using Bar Models

Comparison Word Problem
This video explains how to use bar modeling in Singapore math to solve word problems that deal with comparing. This technique of using model drawings to solve word problems is recommended by the Common Core mathematics standards.
Example: Adam has 11 fewer lollipops than Hope. If Adam has 16 lollipops, how may lollipops does Hope have?



Bar Model (Comparison)
This video employs a visual way to solve world problems using bar modeling. This type of word problem uses the comparison model. Because the part is missing, this is a subtraction problem.
Example: Cayla did 88 sit-ups in the morning. Nekira did 32 sit-ups at night. How many more sit-ups did Cayla do than Nekira?
Introducing Comparison Problems
Example: The Nature Center has a collection of snakes. The redbelly snake in the collection is 9 inches long. The eastern ribbon snake is 21 inches long. How much longer is the eastern ribbon snake than the redbelly snake?


 

Using Comparison Bars

Comparison Bars
This is another strategy we use for story problems that a comparing
Examples:
1. Bob has 14 crackers. Steve ate five fewer than Bob. How many did Steve eat?
2. David has 5 marbles. Anna has 8 marbles. How many more does Anna have than David?
3. Ellie has 9 goldfish. Laney has 5 more goldfish than Ellie. How many goldfish does Laney have?
5. Mark earned $428 doing yard work. Troy earned $186. How much less did Troy earn?
6. Billy has 679 gumballs. He has 278 more gumballs than Lee. How many gumballs does Lee have?
7. Jake has 219 bottlecaps. Then, he found some more.
Now he has 347 bottlecaps. How many bottlecaps did he find?
Comparison Bars
Claire has 8 marbles. Sasha has 15 marbles. How many more marbles does Sasha have than Claire?


How to use the Comparison Bars.

Rotate to landscape screen format on a mobile phone or small tablet to use the Mathway widget, a free math problem solver that answers your questions with step-by-step explanations.


You can use the free Mathway widget below to practice Algebra or other math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.


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