Lesson Plan:

Basic Subtraction with Marshmallows

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Grade
Subject
Standards
August 28, 2015
by Linda F. McGrue

Learning Objectives

Students will be able to illustrate the operation of subtraction with answers of 10 or less.

Lesson

Introduction (5 minutes)

  • Tell the students that today they will continue learning how to subtract.
  • Remind them that subtract means to take away, and the number that is left is called the difference.

Explicit Instruction/Teacher Modeling (10 minutes)

  • Show the subtraction flashcards to the students. Read the subtraction problems together. For example, 7 - 3.
  • Point out to the students that the second number tells how much to take away from the first number.
  • Count out and place 7 cubes where all students can see them.
  • Ask the students how many cubes there are and how many to take away.
  • Remove three cubes. Ask the students how many cubes remain.
  • Repeat the problem and answer for the students, pointing out that there are 4 remaining cubes.
  • Choose another subtraction card and continue in the same manner as the previous problem.

Guided Practice/Interactive Modeling (15 minutes)

  • Pair students together.
  • Give each pair 10 cubes and 2 subtraction flashcards.
  • Instruct them to select one card and read the subtraction problem they see.
  • Have them count out the number of cubes that represents the first number.
  • Tell the students to find the number that is being taken away, and remove that number of cubes.
  • Ask them to tell each other how many they have left.
  • Tell them to read the subtraction problem on their flashcards with the answer.
  • Direct your students to continue in the same manner with the other subtraction flashcard.

Independent Working Time (15 minutes)

  • Give each student a paper plate and cup filled with 10 miniature marshmallows.
  • Pass out four flashcards to each pair.
  • Ask your students to choose one flashcard and read it to their partners.
  • Instruct the other partner to count out the number of marshmallows they will need to depict the number that represents how many there are in all.
  • Have your students take away the second number and identify the answer to the subtraction problem.
  • Direct your students to complete the rest of the problems on their own.

Extend

Differentiation

  • Enrichment: Give students index cards to write down each subtraction problem. Then, have them flip the cards over and write a fact family. For example, have them write 7 - 3 = 4 on the front and then 7 - 4 = 3 on the back.
  • Support: Give students subtraction flashcards with the answers on the back so that they can check their answers.

Related Books and/or Media

Review

Assessment (10 minutes)

  • Give the students the Let's Practice Subtraction worksheet.
  • Collect and check the answers.

Review and Closing (5 minutes)

  • Remind the students of the steps they used when subtracting the cubes and marshmallows.
  • Eat some marshmallows!

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