Representing and solving word problems involves choosing the correct operation (like addition or subtraction), as well as knowing which values to use.

The table^{1} below shows some common types of word problems.

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Two bunnies sat on the grass. Three more bunnies hopped there. How many bunnies are on the grass now?
2 + 3 = ? |
Two bunnies were sitting on the grass. Some more bunnies hopped there. Then there were five bunnies. How many bunnies hopped over to the first two?
2 + ? = 5 |
Some bunnies were sitting on the grass. Three more bunnies hopped there. Then there were five bunnies. How many bunnies were on the grass before?
? + 3 = 5 |

Five apples were on the table. I ate two apples. How many apples are on the table now?
5 - 2 = ? |
Five apples were on the table. I ate some apples. Then there were three apples. How many apples did I eat?
5 - ? = 3 |
Some apples were on the table. I ate two apples. Then there were three apples. How many apples were on the table before?
? - 2 = 3 |

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Three red apples and two green apples are on the table. How many apples are on the table?
3 + 2 = ? |
Five apples are on the table. Three are red and the rest are green. How many apples are green?
3 + ? = 5 , 5 - 3 = ? |
Grandma has five flowers. How many can she put in her red vase and how many in her blue vase?
5 = 0 + 5 , 5 = 5 + 0 5 = 1 + 4 , 5 = 4 + 1 5 = 2 + 3 , 5 = 3 + 2 |

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(“How many more?” version): Lucy has two apples. Julie has five apples. How many more apples does Julie have than Lucy?
(“How many fewer?” version): Lucy has two apples. Julie has five apples. How many fewer apples does Lucy have than Julie?
2 + ? = 5 , 5 - 2 = ? |
(Version with “more”): Julie has three more apples than Lucy. Lucy has two apples. How many apples does Julie have?
(Version with “fewer”): Lucy has 3 fewer apples than Julie. Lucy has two apples. How many apples does Julie have?
2 + 3 = ? , 3 + 2 = ? |
(Version with “more”): Julie has three more apples than Lucy. Julie has five apples. How many apples does Lucy have?
(Version with “fewer”): Lucy has 3 fewer apples than Julie. Julie has five apples. How many apples does Lucy have?
5 - 3 = ? , ? + 3 = 5 |

^{1}contents of table from Table 1 __http://www.corestandards.org/assets/CCSSI_Math%20Standards.pdf__