The following diagrams show the three types of comparison word problems: Difference Unknown, Unknown Big Quantity, Unknown Small Quantity. Scroll down the page for examples and solutions.
There are three main types of comparison word problems.
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
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
How to solve comparison word problems using Bar Models or Tape Diagrams?
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.
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.
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
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?
How to solve comparison word problems using Comparison Bars?
This is another strategy that we can use for story problems that involves comparison.
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?
Claire has 8 marbles. Sasha has 15 marbles. How many more marbles does Sasha have than Claire?
How to use the Comparison Bars?
1. Bill read 5 books. Beth read 2 more books than Bill. How many books did Beth read?
2. Beth read 8 books. Bill read 3 fewer books than Beth. How many books did Bill read?
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