Basic Subtraction with Marshmallows
Students will be able to illustrate the operation of subtraction with answers of 10 or less.
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.
- 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.
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!