Common Core: 3rd Grade Math : Solve Two-Step Word Problems Using the Four Operations: CCSS.Math.Content.3.OA.D.8

Study concepts, example questions & explanations for Common Core: 3rd Grade Math

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Example Questions

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Example Question #771 : Operations & Algebraic Thinking

In Spot’s toy basket he has  balls. There are  more stuffed animals than balls and there is five times the number of ropes than balls. How many toys does Spot have in his basket? 

Possible Answers:

Correct answer:

Explanation:

To solve this problem, we first have to find our unknowns. Our unknowns are the number of ropes and stuffed animals that Spot has. We can set up equations for these unknowns by letting  represent ropes and  represent stuffed animals. 

 because he has  more stuffed animals than his  balls. 

 because he has five times as many ropes as his  balls. 

Now we need to add up our number of balls, stuffed animals and ropes to find our total. 

Example Question #771 : Operations & Algebraic Thinking

Tim swims laps in the pool every day during the week before school. On Monday and Tuesday he swims  laps each day. On Wednesday and Thursday he doubles the number of laps he swims. On Friday, he swims  fewer laps than he swam on Monday. How many total laps does he swim during the week? 

Possible Answers:

Correct answer:

Explanation:

To solve this problem, we first have to find our unknowns. Our unknowns are the number of laps he swims on Wednesday and Thursday and the number of laps he swims on Friday. We can set up equations for these unknowns by letting  represent the laps that he swims on Wednesday and Thursday and  represent the number of laps he swims on Friday. 

 because when we double something we multiply by .

 because he is swimming  less laps than he did on Monday, which means we subtract. 

To find the total amount of laps that he swam, we need to add up the laps that he did each day. 

Example Question #11 : Solving Problems Involving The Four Operations, And Identifying And Explaining Patterns In Arithmetic

There were  families of meerkats that lived in the same burrows. Each family had  meerkats.  meerkats went out to find food, how many are left in the burrows?

Possible Answers:

Correct answer:

Explanation:

To solve this problem, we first have to find our unknowns. Our unknowns are how many meerkats there are total (T) and how many meerkats are left in the burrow (L).

 because there are  families of meerkats and each of them has  members of the family. Each is a keyword for multiplication so that gives us a hint.

 because there are  meerkats total in the burrows and  meerkats are subtracted because they left the burrow.

There are  meerkats left in the burrows.

Example Question #12 : Solving Problems Involving The Four Operations, And Identifying And Explaining Patterns In Arithmetic

Patrick got  baseball trading cards for his birthday from his best friend. The next day he received  more cards from his uncle. He decided to share them equally between himself and his two brothers. How many cards will each child receive?

Possible Answers:

Correct answer:

Explanation:

To solve this problem, we first have to find our unknowns. Our unknowns are how many baseball cards Patrick received in total (T) and how many cards each child will receive (C).

 because he received  cards from his friend and then another  from his uncle. The cards would be added together to find the total.

÷ because there are  cards total and they are being shared equally among Patrick AND his two brothers so there are  children total. "Shared equally" is a keyword for division.

Each child will receive  cards in total.

Example Question #13 : Solving Problems Involving The Four Operations, And Identifying And Explaining Patterns In Arithmetic

In Denver, it snowed 5 inches on Monday, 6 inches on Tuesday, 3 inches on Thursday, and 1 inch on Friday. On Saturday, it snowed three times as much as the rest of the week. How much did it snow on Saturday?

Possible Answers:

 inches

 inches

 inches

 inches

Correct answer:

 inches

Explanation:

To solve this problem, we first have to find our unknowns. Our unknowns are how much did it snow during the weekdays (W) and how much did it snow on Saturday (S).

 because we need to know how much it snowed during the weekdays in total. We must add together the amount of snow from Monday, Tuesday, Thursday, and Friday.

 because it snowed  times as much on Saturday as it did the rest of the week. The total snow from the weekdays will be multiplied by  to find out how much it snowed on Saturday.

On Saturday it snowed a total of  inches.

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