Place Value Superheroes: Subtracting Ones!

Math Grades 1st Grade 2:44 Video
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Lesson Description

Learn how place value helps us subtract ones from two-digit numbers. Just like the Khan Academy video, we'll use tens and ones to become subtraction superheroes!

Video Resource

Understanding place value while subtracting ones | Early Math | Khan Academy

Khan Academy

Duration: 2:44
Watch on YouTube

Key Concepts

  • Place value (tens and ones)
  • Subtraction as taking away
  • Subtracting ones from a two-digit number

Learning Objectives

  • Students will be able to identify the tens and ones place in a two-digit number.
  • Students will be able to subtract a one-digit number from a two-digit number by focusing on the ones place.
  • Students will be able to explain how subtracting ones affects the ones place while the tens place remains the same.

Educator Instructions

  • Introduction (5 mins)
    Begin by reviewing place value. Ask students what the numbers in 23 mean. What does the 2 stand for? (2 tens) What does the 3 stand for? (3 ones). Discuss how numbers are made of tens and ones.
  • Video Time (7 mins)
    Play the Khan Academy video: 'Understanding place value while subtracting ones'. Encourage students to follow along with the example in the video.
  • Practice with Blocks (10 mins)
    Use base-ten blocks to represent numbers. Start with a number like 35 (3 tens and 5 ones). Ask students to subtract 2. Guide them to remove 2 ones blocks. What is left? (3 tens and 3 ones, or 33). Repeat with different numbers and subtractions.
  • Worksheet Activity (10 mins)
    Distribute a worksheet with subtraction problems like 47 - 3 = ?. Students should solve the problems, drawing base-ten blocks if needed.
  • Wrap Up (3 mins)
    Review the key concepts. What happens to the tens place when we only subtract ones? (It stays the same). Why? (Because we are only taking away from the ones).

Interactive Exercises

  • Online Game
    Play an online place value subtraction game on a platform like ABCya or Starfall. This provides a fun and interactive way to reinforce the concepts.

Discussion Questions

  • What is place value?
  • How does knowing place value help us subtract?
  • What happens when we subtract ones from a number?

Skills Developed

  • Understanding place value
  • Subtraction skills
  • Problem-solving

Multiple Choice Questions

Question 1:

What does the 3 in 38 stand for?

Correct Answer: 3 tens

Question 2:

If you have 25 blocks, how many are in the 'ones' place?

Correct Answer: 5

Question 3:

What is 49 - 5?

Correct Answer: 44

Question 4:

Which number is in the tens place in 62?

Correct Answer: 6

Question 5:

If you have 5 tens and 3 ones, what number do you have?

Correct Answer: 53

Question 6:

What happens to the tens place when you subtract only ones?

Correct Answer: It stays the same

Question 7:

If you start with 17 and subtract 4, how many ones are left?

Correct Answer: 3

Question 8:

What does 10 ones equal?

Correct Answer: 1 ten

Question 9:

Which problem shows subtracting ones?

Correct Answer: 35 - 2

Question 10:

What is 66 - 3?

Correct Answer: 63

Fill in the Blank Questions

Question 1:

The number 72 has 7 _______ and 2 ones.

Correct Answer: tens

Question 2:

When you subtract, you are _______ away.

Correct Answer: taking

Question 3:

45 - 2 = _______

Correct Answer: 43

Question 4:

The number 8 in 81 is in the _______ place.

Correct Answer: tens

Question 5:

If you have 9 tens and subtract nothing, you still have _______ tens.

Correct Answer: 9

Question 6:

In the number 57, the 7 is in the _______ place.

Correct Answer: ones

Question 7:

68 - 5 = _______

Correct Answer: 63

Question 8:

Subtracting only ones changes the _______ place.

Correct Answer: ones

Question 9:

29 - 6 = _______

Correct Answer: 23

Question 10:

The value of the 4 in 42 is _______.

Correct Answer: 40

Educational Standards

1.NBT.B.2:Understand that the two digits of a two-digit number represent amounts of tens and ones. 1.NBT.C.5:Given a two-digit number, mentally find 10 more or 10 less than the number, without having to count; explain the reasoning used. 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.

Teaching Materials

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