Shark Subtraction: Solving Word Problems Within 10

Math Grades 1st Grade 1:02 Video
Print Lesson Plan Watch Video

Lesson Description

Learn how to solve subtraction word problems using numbers up to 10, just like counting sharks!

Video Resource

Subtraction word problems within 10 | Basic addition and subtraction | Early Math | Khan Academy

Khan Academy

Duration: 1:02
Watch on YouTube

Key Concepts

  • Subtraction as taking away
  • Solving word problems
  • Numbers within 10

Learning Objectives

  • Students will be able to solve subtraction word problems with numbers within 10.
  • Students will be able to represent subtraction using objects (like drawings of sharks).
  • Students will be able to write a subtraction equation to match a word problem.

Educator Instructions

  • Introduction (5 mins)
    Begin by asking students if they know what subtraction means. Discuss everyday examples like sharing toys or eating snacks. Introduce the idea of 'taking away'.
  • Video Viewing (5 mins)
    Watch the Khan Academy video 'Subtraction word problems within 10'. Pause at key points to ask questions and check for understanding. For example, after the problem is introduced, ask 'What is the problem asking us to find out?'
  • Guided Practice (10 mins)
    Work through a few similar subtraction word problems as a class. Use drawings or manipulatives (like counters) to represent the objects in the word problems. Guide students to write the subtraction equation that matches the problem.
  • Independent Practice (10 mins)
    Provide students with a worksheet containing subtraction word problems. Encourage them to draw pictures or use counters to solve the problems. Circulate and provide support as needed.
  • Wrap-up (5 mins)
    Review the key concepts of the lesson. Ask students to share their strategies for solving subtraction word problems.

Interactive Exercises

  • Shark Subtraction Story
    Tell different shark subtraction stories as a class (e.g., 'There were 7 sharks swimming. 3 sharks swam away. How many are left?'). Have students act out the problems using their fingers or small toys.
  • Subtraction Equation Match
    Write subtraction word problems on one set of cards and matching equations on another set. Have students match the word problems to the correct equations.

Discussion Questions

  • What does 'subtract' mean?
  • How can drawing a picture help you solve a word problem?
  • What are some words that tell you to subtract?

Skills Developed

  • Problem-solving
  • Critical thinking
  • Number sense

Multiple Choice Questions

Question 1:

There were 5 fish. 2 swam away. How many fish are left?

Correct Answer: 3

Question 2:

What does 'subtract' mean?

Correct Answer: To take away

Question 3:

If you have 8 cookies and you eat 3, how many cookies do you have left?

Correct Answer: 5

Question 4:

Which equation shows 6 take away 1?

Correct Answer: 6 - 1

Question 5:

You have 9 toys and give away 4. How many toys are left?

Correct Answer: 5

Question 6:

What number is one less than 7?

Correct Answer: 6

Question 7:

There are 10 birds. 5 fly away. How many birds are still there?

Correct Answer: 5

Question 8:

Which sign means 'take away'?

Correct Answer: -

Question 9:

You had 4 balloons. One popped. How many balloons do you have now?

Correct Answer: 3

Question 10:

Start with 6. Take away 2. What do you have?

Correct Answer: 4

Fill in the Blank Questions

Question 1:

8 - 3 = ______

Correct Answer: 5

Question 2:

There were 7 cookies. I ate 2. Now there are ______ cookies.

Correct Answer: 5

Question 3:

10 - 4 = ______

Correct Answer: 6

Question 4:

If you have 6 pencils and lose 1, you have ______ pencils left.

Correct Answer: 5

Question 5:

9 - ______ = 4

Correct Answer: 5

Question 6:

5 - 0 = ______

Correct Answer: 5

Question 7:

There are 4 cats, 1 runs away, now there are ______ cats.

Correct Answer: 3

Question 8:

7 - 5 = ______

Correct Answer: 2

Question 9:

______ - 2 = 3

Correct Answer: 5

Question 10:

6 - 3 = ______

Correct Answer: 3

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.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). CCSS.Math.Content.1.OA.D.8:Determine the unknown whole number in an addition or subtraction equation relating three whole numbers. For example, determine the unknown number that makes the equation true in each of the equations 8 + ? = 11, 5 = _ - 3, 6 + 6 = _.

Teaching Materials

Download ready-to-use materials for this lesson:

Student Worksheet Classroom Slides Assessment Quiz Export to Google Docs
Add to Google Classroom

User Actions

Sign in to save this lesson plan to your favorites.

Sign In

Share This Lesson

Related Lesson Plans