Snowy Subtraction: Solving Word Problems!

Math Grades 1st Grade 4:18 Video
Print Lesson Plan Watch Video

Lesson Description

Learn how to solve addition and subtraction word problems within 100 using the snowy story of Chillytown!

Video Resource

Snow on Friday | Addition and subtraction within 100 | Early Math | Khan Academy

Khan Academy

Duration: 4:18
Watch on YouTube

Key Concepts

  • Word Problems
  • Addition and Subtraction within 100
  • Unknown Addends
  • Place Value

Learning Objectives

  • Students will be able to identify the unknown number in addition and subtraction word problems.
  • Students will be able to solve addition and subtraction problems within 100.
  • Students will be able to relate addition and subtraction as inverse operations.

Educator Instructions

  • Introduction (5 mins)
    Begin by asking students if they've ever experienced a snow day. Discuss how much snow is needed to cancel school. Introduce the concept of measuring snow depth in centimeters.
  • Video Viewing (7 mins)
    Play the Khan Academy video 'Snow on Friday | Addition and subtraction within 100 | Early Math | Khan Academy'. Encourage students to pay attention to how the problem is set up and solved.
  • Guided Practice (10 mins)
    Work through the snow problem again as a class, pausing at each step. Ask questions like: * What information are we given? * What are we trying to find out? * How can we write this as an equation? * How does the video use addition and subtraction?
  • Independent Practice (10 mins)
    Present students with similar word problems (e.g., 'Lily had 32 stickers. She gave 15 to her friend. How many stickers does Lily have left?'). Have them work individually or in pairs to solve the problems.
  • Wrap-up (3 mins)
    Review the key concepts learned in the lesson. Ask students to share their strategies for solving word problems.

Interactive Exercises

  • Snowflake Subtraction
    Provide students with manipulatives (e.g., small cubes, counters, or even paper snowflakes). Present a word problem and have them use the manipulatives to model the problem and find the solution.
  • Number Line Jump
    Use a number line to visualize addition and subtraction. For example, if the problem is 84 - 55, start at 84 and jump back 55 spaces to find the answer.

Discussion Questions

  • What is the difference between addition and subtraction?
  • How can drawing a picture help you solve a word problem?
  • Can you think of a time you used addition or subtraction in real life?

Skills Developed

  • Problem-solving
  • Critical thinking
  • Number sense
  • Applying mathematical concepts

Multiple Choice Questions

Question 1:

What does 'plus' mean?

Correct Answer: To add more

Question 2:

What does 'minus' mean?

Correct Answer: To take away

Question 3:

If you have 10 cookies and eat 3, how many are left?

Correct Answer: 7

Question 4:

What is 20 + 5?

Correct Answer: 25

Question 5:

Lisa has 12 toys. Her mom gives her 6 more. How many does she have now?

Correct Answer: 18

Question 6:

What does the equal sign (=) mean?

Correct Answer: The same as

Question 7:

Which one of these means take away?

Correct Answer: -

Question 8:

If a problem says 'in all', should you add or subtract?

Correct Answer: Add

Question 9:

There are 40 birds sitting on a tree. 10 birds fly away. How many are left?

Correct Answer: 30

Question 10:

What number plus 10 equals 20?

Correct Answer: 10

Fill in the Blank Questions

Question 1:

When you add, the number gets ________.

Correct Answer: bigger

Question 2:

When you subtract, the number gets ________.

Correct Answer: smaller

Question 3:

5 + 5 = ________.

Correct Answer: 10

Question 4:

10 - 2 = ________.

Correct Answer: 8

Question 5:

If you have 6 apples and your friend gives you 3 more, you have ________ apples.

Correct Answer: 9

Question 6:

15 + 5 = ________

Correct Answer: 20

Question 7:

25 - 10 = ________

Correct Answer: 15

Question 8:

The answer to an addition problem is called the ________.

Correct Answer: sum

Question 9:

The answer to a subtraction problem is called the ________.

Correct Answer: difference

Question 10:

If a problem says 'how many are left', you should ________.

Correct Answer: subtract

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.NBT.C.4:Add within 100, including adding a two-digit number and a one-digit number, and adding a two-digit number and a multiple of 10, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method and explain the reasoning used. Understand that in adding two-digit numbers, one adds tens and tens, ones and ones; and sometimes it is necessary to compose a ten. 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