Haircuts and Helpers: Learning Repeated Addition

Math Grades 1st Grade 2:09 Video
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Lesson Description

Learn how to solve word problems by adding the same number again and again. Just like Rafael and his haircuts!

Video Resource

Repeated addition example | Addition and subtraction within 100 | Early Math | Khan Academy

Khan Academy

Duration: 2:09
Watch on YouTube

Key Concepts

  • Repeated Addition
  • Word Problems
  • Addition within 20

Learning Objectives

  • Students will be able to solve word problems involving repeated addition.
  • Students will be able to represent repeated addition as a sum of equal addends.

Educator Instructions

  • Introduction (5 mins)
    Begin by asking students if they've ever gotten a haircut. Ask if they get haircuts regularly (e.g., once a month). Explain that today they'll be solving a problem about Rafael and his haircuts. Show the Khan Academy video 'Repeated addition example | Addition and subtraction within 100 | Early Math | Khan Academy'.
  • Guided Practice (10 mins)
    After watching the video, revisit the problem of Rafael and his haircuts. Guide students through the problem-solving process, emphasizing how each season Rafael gets two haircuts. Write the repeated addition equation (2 + 2 + 2 + 2) on the board. Explain that this is repeated addition because we are adding the same number again and again.
  • Independent Practice (10 mins)
    Present the students with new word problems involving repeated addition. Examples: 1. Lily has 3 fishbowls. She puts 3 fish in each bowl. How many fish does Lily have? 2. Tom has 2 bags of cookies. Each bag has 4 cookies. How many cookies does Tom have? Have students solve these problems independently, drawing pictures or using manipulatives (e.g., counters) if needed.
  • Wrap-up (5 mins)
    Review the solutions to the independent practice problems. Emphasize the connection between the word problems and the repeated addition equations. Ask students to share how they solved the problems.

Interactive Exercises

  • Building with Blocks
    Provide students with building blocks. Present a word problem (e.g., 'Sarah has 4 friends. She gives each friend 2 blocks. How many blocks does she give away?'). Have students use the blocks to model the problem and find the solution. Each group of blocks represent the amount given to one friend.
  • Drawing Pictures
    Present students with word problems (e.g., 'A farmer has 3 rows of corn. Each row has 5 corn plants. How many corn plants are there?'). Have students draw pictures to represent the problem and find the solution.

Discussion Questions

  • What is repeated addition?
  • Can you think of other times when you might use repeated addition?

Skills Developed

  • Problem-solving
  • Addition
  • Representation of mathematical concepts

Multiple Choice Questions

Question 1:

What is 2 + 2 + 2?

Correct Answer: 6

Question 2:

Tim has 3 bags. Each bag has 1 apple. How many apples does Tim have?

Correct Answer: 3

Question 3:

What does 'repeated addition' mean?

Correct Answer: Adding the same number many times

Question 4:

Lisa has 2 flowers. Each flower has 5 petals. How many petals are there in all?

Correct Answer: 10

Question 5:

What is 4 + 4?

Correct Answer: 8

Question 6:

Ben has 3 boxes of crayons. Each box has 2 crayons. How many crayons does Ben have?

Correct Answer: 6

Question 7:

What is 1 + 1 + 1 + 1?

Correct Answer: 4

Question 8:

Sara has 2 friends. She gives each friend 3 stickers. How many stickers does she give away?

Correct Answer: 6

Question 9:

What is 3 + 3?

Correct Answer: 6

Question 10:

Jake has 4 cars. Each car has 1 driver. How many drivers are there in all?

Correct Answer: 4

Fill in the Blank Questions

Question 1:

2 + 2 + 2 = ____

Correct Answer: 6

Question 2:

1 + 1 + 1 = ____

Correct Answer: 3

Question 3:

3 + 3 + 3 = ____

Correct Answer: 9

Question 4:

4 + 4 = ____

Correct Answer: 8

Question 5:

If I have 2 groups of 4, I have ____ in all.

Correct Answer: 8

Question 6:

1 + 1 + 1 + 1 + 1 = ____

Correct Answer: 5

Question 7:

5 + 5 = ____

Correct Answer: 10

Question 8:

If I have 3 groups of 2, I have ____ in all.

Correct Answer: 6

Question 9:

2 + 2 + 2 + 2 = ____

Correct Answer: 8

Question 10:

4 + 4 + 4 = ____

Correct Answer: 12

Educational Standards

CCSS.Math.Content.1.OA.A.1:Use addition and subtraction within 20 to solve word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions, e.g., by using objects, drawings, and equations with a symbol for the unknown number to represent the problem. CCSS.Math.Content.1.OA.C.5:Relate counting to addition and subtraction (e.g., by counting on 2 to add 2). CCSS.Math.Content.1.OA.C.6:Add and subtract within 20, demonstrating fluency for addition and subtraction within 10. Use strategies such as counting on; making ten (e.g., 8 + 6 = 8 + 2 + 4 = 10 + 4 = 14); decomposing a number leading to a ten (e.g., 13 - 4 = 13 - 3 - 1 = 10 - 1 = 9); using the relationship between addition and subtraction (e.g., knowing that 8 + 4 = 12, one knows 12 - 8 = 4); and creating equivalent but easier or known sums (e.g., adding 6 + 7 by creating the known equivalent 6 + 6 + 1 = 12 + 1 = 13).

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