Crayon Countdown: Solving Subtraction Stories!

Math Grades 1st Grade 4:24 Video
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Lesson Description

Learn how to solve subtraction word problems within 100 using crayons as a fun, visual aid! We'll explore tens and ones to find out how many crayons are used.

Video Resource

Using crayons | Addition and subtraction within 100 | Early Math | Khan Academy

Khan Academy

Duration: 4:24
Watch on YouTube

Key Concepts

  • Subtraction
  • Place Value (Tens and Ones)
  • Word Problems
  • Representing numbers visually

Learning Objectives

  • Students will be able to solve subtraction word problems within 100.
  • Students will be able to use place value (tens and ones) to subtract.
  • Students will be able to represent subtraction problems visually using drawings.
  • Students will be able to understand subtraction as taking away or finding the difference.

Educator Instructions

  • Introduction (5 mins)
    Start by asking students what they know about subtraction. Discuss how subtraction is taking away. Show students a box of crayons and ask what happens when you use some of the crayons.
  • Video Viewing (7 mins)
    Play the Khan Academy video 'Using crayons | Addition and subtraction within 100 | Early Math | Khan Academy'. Encourage students to follow along and think about the problem.
  • Guided Practice (10 mins)
    Work through the crayon problem from the video together. Emphasize the importance of identifying the 'start number,' the 'number used,' and the 'number remaining.' Use base ten blocks or drawings to represent the crayons and model the subtraction process.
  • Independent Practice (10 mins)
    Provide students with similar word problems involving subtraction within 100. Encourage them to draw pictures or use base ten blocks to solve the problems. Circulate and provide support as needed.
  • Wrap-up (3 mins)
    Review the key concepts of subtraction and place value. Ask students to share their strategies for solving the word problems.

Interactive Exercises

  • Crayon Subtraction Game
    Provide each student with a bag of crayons (e.g., 50-100 crayons). Give them a subtraction word problem, such as 'You have 65 crayons and give 22 to a friend. How many crayons do you have left?' Students use their crayons to model the problem and find the answer.
  • Base Ten Block Subtraction
    Using base ten blocks, represent a two-digit number. Then, give the students a subtraction problem to solve using the blocks. For example, represent 47 with 4 tens and 7 ones. Then subtract 23 by removing 2 tens and 3 ones. Ask, 'How many tens and ones are left?'

Discussion Questions

  • What does it mean to subtract?
  • How can drawing pictures help us solve subtraction problems?
  • How do tens and ones help us subtract bigger numbers?
  • Can you think of a time you used subtraction today?

Skills Developed

  • Problem-solving
  • Critical Thinking
  • Place Value Understanding
  • Visual Representation
  • Subtraction Proficiency

Multiple Choice Questions

Question 1:

What does it mean to subtract?

Correct Answer: To take away

Question 2:

If you have 25 crayons and you give 10 away, how many crayons do you have left?

Correct Answer: 15

Question 3:

Which number is in the tens place in 42?

Correct Answer: 4

Question 4:

Which number is in the ones place in 78?

Correct Answer: 8

Question 5:

If you start with 50 and subtract 20, what do you have?

Correct Answer: 30

Question 6:

Lisa has 34 stickers. She uses 11. How many are left?

Correct Answer: 23

Question 7:

Tom has 68 marbles. He loses 8. How many are left?

Correct Answer: 60

Question 8:

What does 'remain' mean?

Correct Answer: What is left

Question 9:

Sam had 99 cookies and ate 9 cookies. How many does Sam have left?

Correct Answer: 90

Question 10:

A class has 45 students, but 5 were absent. How many were present?

Correct Answer: 50

Fill in the Blank Questions

Question 1:

Subtraction means to ______ away.

Correct Answer: take

Question 2:

The number 35 has 3 _____ and 5 ones.

Correct Answer: tens

Question 3:

64 - 21 = ______

Correct Answer: 43

Question 4:

If you have 40 and subtract 10, you have _____.

Correct Answer: 30

Question 5:

Taking away is called ______.

Correct Answer: subtraction

Question 6:

I had 23 balloons, the wind took 3, I have _____ balloons.

Correct Answer: 20

Question 7:

The answer to a subtraction problem is the ______.

Correct Answer: difference

Question 8:

72 - 40 = ______

Correct Answer: 32

Question 9:

99 minus 10 equals ____.

Correct Answer: 89

Question 10:

If you start with a big group and take some away, you are ______.

Correct Answer: subtracting

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.NBT.B.2:Understand that the two digits of a two-digit number represent amounts of tens and ones. Understand the following as special cases:

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