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Sub Plans: 3-Digit Adventures!

Lesson Plan

Sub Plans: 3-Digit Adventures!

Students will accurately solve 3-digit addition and subtraction story problems, including both one-step and two-step scenarios, demonstrating their understanding of mathematical operations in real-world contexts.

Understanding how to solve word problems with larger numbers is a crucial life skill! It helps students make sense of situations involving money, measurements, and quantities, building a strong foundation for future math success.

Audience

3rd Grade Students

Time

30 minutes

Approach

Students will work through story problems independently.

Materials

Whiteboard or Projector, Sub Plans: 3-Digit Story Problems, and Answer Key: 3-Digit Story Problems

Prep

Prepare Materials

5 minutes

Step 1

Introduction (Optional)

5 minutes

  • The substitute teacher can briefly introduce the activity, explaining that students will be working on story problems involving 3-digit numbers.
    - Emphasize reading each problem carefully to identify whether it's an addition or subtraction problem, and if it requires one or two steps.

Step 2

Independent Work: Story Problems

20 minutes

  • Distribute the Sub Plans: 3-Digit Story Problems to each student.
    - Instruct students to read each problem carefully and solve it, showing their work.
    - Remind them to pay attention to details and to think about what the problem is asking for.
    - Circulate to provide support and answer questions as needed.

Step 3

Wrap-up (Optional)

5 minutes

  • If time allows, the substitute can briefly discuss a few problems as a class, or collect the worksheets for review.
    - Remind students of the importance of checking their work and understanding the context of the problems.
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Slide Deck

Welcome, Math Detectives!

Today, we're going on an adventure to solve some awesome math mysteries!

Welcome students and introduce the day's math activity. Explain that they will be practicing their 3-digit addition and subtraction skills with story problems.

Story Problem Challenge!

Read carefully!
What is the problem asking?
Are you adding (+) or subtracting (-)?
Show your work!

Explain that story problems are like real-life math puzzles. The key is to read carefully and figure out what the problem is asking. Remind them to look for keywords that tell them if they need to add or subtract.

One Step or Two Steps?

Some problems need just one step.
Others need two steps!
Think it through!

Briefly mention that some problems might need more than one step. Encourage students to think through the entire problem before jumping to solve.

Your Mission, Should You Choose to Accept It...

You have a set of story problems to solve.
Work carefully and do your best!
Good luck, mathletes!

Tell students they will be working on a packet of problems independently. Reiterate that if they have questions, they should try their best and then ask the substitute if they are still stuck.

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Worksheet

Sub Plans: 3-Digit Story Problems

Name: ________________________
Date: ________________________

Page 1: One-Step Addition

  1. The school library had 345 adventure books. They received a donation of 218 more adventure books. How many adventure books does the library have now?





  2. A baker made 175 chocolate chip cookies in the morning and 320 oatmeal cookies in the afternoon. How many cookies did the baker make in total?





Page 2: One-Step Subtraction

  1. There were 587 students at the assembly. 132 students left early. How many students remained at the assembly?





  2. A farmer harvested 963 apples. He sold 421 apples at the market. How many apples does the farmer have left?





Page 3: One-Step Addition

  1. A video game store had 299 new games in stock. They received a delivery of 150 more games. How many new games does the store have now?





  2. Sarah collected 467 stickers. Her friend gave her 125 more stickers. How many stickers does Sarah have in all?





Page 4: One-Step Subtraction

  1. A factory produced 789 toy cars. During quality control, 245 cars were found to have defects. How many toy cars were good?





  2. There were 620 balloons for a party. 305 balloons floated away. How many balloons are left?





Page 5: One-Step Addition

  1. A train traveled 380 miles on Monday and 275 miles on Tuesday. What is the total distance the train traveled?





  2. A school raised $410 for new playground equipment. They then raised another $355 at a bake sale. How much money did they raise altogether?





Page 6: Two-Step Problems

  1. Mark had 450 marbles. He won 125 marbles in a game, but then lost 80 marbles in another game. How many marbles does Mark have now?










  2. A pet store had 270 fish and 130 birds. They sold 50 fish and 20 birds. How many pets are left in the store?










Page 7: Two-Step Problems

  1. Emily baked 320 cookies for a school fair. Her friend baked 150 cookies. If they sold 200 cookies, how many cookies are left?










  2. A bus started with 150 passengers. At the first stop, 45 passengers got off and 20 new passengers got on. How many passengers are on the bus now?










Page 8: Two-Step Problems

  1. There are 560 red apples and 380 green apples in an orchard. If 120 apples are picked, how many apples are still on the trees?










  2. A book store received 400 new mystery books and 250 new science fiction books. They sold 175 books in total. How many books are left in the store?










Page 9: Two-Step Problems

  1. A construction worker had 700 bricks. He used 280 bricks for one wall and 150 bricks for another wall. How many bricks does he have left?










  2. A school collected 315 cans in week one and 260 cans in week two. They gave 180 cans to a local shelter. How many cans do they have remaining?










Page 10: Two-Step Problems

  1. A zookeeper had 390 bananas for the monkeys. He bought 200 more, but then 110 bananas spoiled. How many good bananas does the zookeeper have?










  2. A shop started the day with 850 t-shirts. They sold 320 t-shirts in the morning and 250 t-shirts in the afternoon. How many t-shirts are left?

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Answer Key

Answer Key: 3-Digit Story Problems

Page 1: One-Step Addition

  1. Problem: The school library had 345 adventure books. They received a donation of 218 more adventure books. How many adventure books does the library have now?

    • Thought Process: To find the total number of adventure books, we need to add the initial number of books to the number of donated books.
    • Solution: 345 + 218 = 563 adventure books

  2. Problem: A baker made 175 chocolate chip cookies in the morning and 320 oatmeal cookies in the afternoon. How many cookies did the baker make in total?

    • Thought Process: To find the total number of cookies, we add the chocolate chip cookies to the oatmeal cookies.
    • Solution: 175 + 320 = 495 cookies

Page 2: One-Step Subtraction

  1. Problem: There were 587 students at the assembly. 132 students left early. How many students remained at the assembly?

    • Thought Process: To find out how many students remained, we subtract the number of students who left from the initial number of students.
    • Solution: 587 - 132 = 455 students

  2. Problem: A farmer harvested 963 apples. He sold 421 apples at the market. How many apples does the farmer have left?

    • Thought Process: To find the number of apples left, we subtract the number of apples sold from the total harvested apples.
    • Solution: 963 - 421 = 542 apples

Page 3: One-Step Addition

  1. Problem: A video game store had 299 new games in stock. They received a delivery of 150 more games. How many new games does the store have now?

    • Thought Process: To find the total number of games, we add the initial games in stock to the delivered games.
    • Solution: 299 + 150 = 449 new games

  2. Problem: Sarah collected 467 stickers. Her friend gave her 125 more stickers. How many stickers does Sarah have in all?

    • Thought Process: To find the total number of stickers, we add the stickers Sarah collected to the stickers her friend gave her.
    • Solution: 467 + 125 = 592 stickers

Page 4: One-Step Subtraction

  1. Problem: A factory produced 789 toy cars. During quality control, 245 cars were found to have defects. How many toy cars were good?

    • Thought Process: To find the number of good toy cars, we subtract the defective cars from the total produced cars.
    • Solution: 789 - 245 = 544 toy cars

  2. Problem: There were 620 balloons for a party. 305 balloons floated away. How many balloons are left?

    • Thought Process: To find the number of balloons left, we subtract the balloons that floated away from the initial number of balloons.
    • Solution: 620 - 305 = 315 balloons

Page 5: One-Step Addition

  1. Problem: A train traveled 380 miles on Monday and 275 miles on Tuesday. What is the total distance the train traveled?

    • Thought Process: To find the total distance, we add the miles traveled on Monday to the miles traveled on Tuesday.
    • Solution: 380 + 275 = 655 miles

  2. Problem: A school raised $410 for new playground equipment. They then raised another $355 at a bake sale. How much money did they raise altogether?

    • Thought Process: To find the total money raised, we add the initial amount to the amount raised at the bake sale.
    • Solution: $410 + $355 = $765

Page 6: Two-Step Problems

  1. Problem: Mark had 450 marbles. He won 125 marbles in a game, but then lost 80 marbles in another game. How many marbles does Mark have now?

    • Thought Process: First, add the marbles won to the starting amount. Then, subtract the marbles lost.
    • Solution: 450 + 125 = 575 marbles. Then, 575 - 80 = 495 marbles.

  2. Problem: A pet store had 270 fish and 130 birds. They sold 50 fish and 20 birds. How many pets are left in the store?

    • Thought Process: First, find the total number of fish and birds. Then, find the total number of fish and birds sold. Finally, subtract the total sold from the total initial pets.
    • Solution: 270 + 130 = 400 total pets. 50 + 20 = 70 total pets sold. 400 - 70 = 330 pets left.

Page 7: Two-Step Problems

  1. Problem: Emily baked 320 cookies for a school fair. Her friend baked 150 cookies. If they sold 200 cookies, how many cookies are left?

    • Thought Process: First, add the cookies Emily baked to the cookies her friend baked to find the total. Then, subtract the cookies sold.
    • Solution: 320 + 150 = 470 cookies. Then, 470 - 200 = 270 cookies left.

  2. Problem: A bus started with 150 passengers. At the first stop, 45 passengers got off and 20 new passengers got on. How many passengers are on the bus now?

    • Thought Process: First, subtract the passengers who got off. Then, add the new passengers who got on.
    • Solution: 150 - 45 = 105 passengers. Then, 105 + 20 = 125 passengers.

Page 8: Two-Step Problems

  1. Problem: There are 560 red apples and 380 green apples in an orchard. If 120 apples are picked, how many apples are still on the trees?

    • Thought Process: First, add the red and green apples to find the total. Then, subtract the picked apples.
    • Solution: 560 + 380 = 940 apples. Then, 940 - 120 = 820 apples.

  2. Problem: A book store received 400 new mystery books and 250 new science fiction books. They sold 175 books in total. How many books are left in the store?

    • Thought Process: First, add the mystery and science fiction books to find the total received. Then, subtract the books sold.
    • Solution: 400 + 250 = 650 books. Then, 650 - 175 = 475 books left.

Page 9: Two-Step Problems

  1. Problem: A construction worker had 700 bricks. He used 280 bricks for one wall and 150 bricks for another wall. How many bricks does he have left?

    • Thought Process: First, add the bricks used for both walls to find the total used. Then, subtract the total used from the initial number of bricks.
    • Solution: 280 + 150 = 430 bricks used. Then, 700 - 430 = 270 bricks left.

  2. Problem: A school collected 315 cans in week one and 260 cans in week two. They gave 180 cans to a local shelter. How many cans do they have remaining?

    • Thought Process: First, add the cans collected in week one and week two. Then, subtract the cans given to the shelter.
    • Solution: 315 + 260 = 575 cans. Then, 575 - 180 = 395 cans remaining.

Page 10: Two-Step Problems

  1. Problem: A zookeeper had 390 bananas for the monkeys. He bought 200 more, but then 110 bananas spoiled. How many good bananas does the zookeeper have?

    • Thought Process: First, add the bananas bought to the initial amount. Then, subtract the spoiled bananas.
    • Solution: 390 + 200 = 590 bananas. Then, 590 - 110 = 480 good bananas.

  2. Problem: A shop started the day with 850 t-shirts. They sold 320 t-shirts in the morning and 250 t-shirts in the afternoon. How many t-shirts are left?

    • Thought Process: First, add the t-shirts sold in the morning and afternoon to find the total sold. Then, subtract the total sold from the initial number of t-shirts.
    • Solution: 320 + 250 = 570 t-shirts sold. Then, 850 - 570 = 280 t-shirts left.
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