Subtraction Station: 3-Digit Numbers Without a Borrow!

Math Grades 1st Grade 2:56 Video
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Lesson Description

Learn how to subtract 3-digit numbers using place value. No borrowing needed!

Video Resource

Subtracting 3-digit numbers (no regrouping) | 2nd grade | Khan Academy

Khan Academy

Duration: 2:56
Watch on YouTube

Key Concepts

  • Place Value (Hundreds, Tens, Ones)
  • Subtraction
  • Representing Numbers with Visual Aids

Learning Objectives

  • Students will be able to identify the place value of digits in a 3-digit number.
  • Students will be able to subtract 3-digit numbers without regrouping, using place value understanding.
  • Students will be able to explain the process of subtraction using hundreds, tens, and ones.

Educator Instructions

  • Introduction (5 mins)
    Begin by reviewing the concept of place value (hundreds, tens, and ones) using visual aids like base-ten blocks or drawings. Ask students to identify the place value of different digits in numbers like 235, 102, and 460.
  • Video Viewing (7 mins)
    Show the Khan Academy video: 'Subtracting 3-digit numbers (no regrouping)'. Remind students to pay attention to how the presenter uses place value to subtract.
  • Guided Practice (10 mins)
    Work through a few subtraction problems on the board, modeling the process shown in the video. For example, 478 - 123. Emphasize subtracting ones from ones, tens from tens, and hundreds from hundreds. Use drawings or base-ten blocks to represent the numbers and the subtraction process.
  • Independent Practice (10 mins)
    Provide students with worksheets containing 3-digit subtraction problems without regrouping. Have them solve the problems independently, using the methods they learned from the video and guided practice.
  • Wrap-up (3 mins)
    Review the key concepts of the lesson and answer any remaining questions. Ask students to explain in their own words how to subtract 3-digit numbers without regrouping.

Interactive Exercises

  • Place Value Game
    Use large index cards to create hundreds, tens, and ones cards. Call out a 3-digit number and have students hold up the correct number of cards for each place value (e.g., for 321, they would hold up three '100' cards, two '10' cards, and one '1' card).
  • Subtraction Story Problems
    Create simple word problems that require 3-digit subtraction (without regrouping). Have students solve the problems and explain their thinking. Example: 'There were 456 cookies in a jar. Lily ate 23 cookies. How many cookies are left?'

Discussion Questions

  • What does the number in the hundreds place mean?
  • Why is it important to subtract the ones first, then the tens, then the hundreds?
  • Can you think of a time you might need to subtract 3-digit numbers in real life?

Skills Developed

  • Understanding Place Value
  • Subtraction Skills
  • Problem-Solving

Multiple Choice Questions

Question 1:

What number is in the HUNDREDS place in 357?

Correct Answer: 3

Question 2:

What does the number 5 in 357 mean?

Correct Answer: 5 tens

Question 3:

What does the number 7 in 357 mean?

Correct Answer: 7 ones

Question 4:

What is 4 - 2?

Correct Answer: 2

Question 5:

What is 5 - 5?

Correct Answer: 0

Question 6:

What is 7 - 1?

Correct Answer: 6

Question 7:

What is 357 - 251? What number is in the hundreds place?

Correct Answer: 1

Question 8:

What is 357 - 251? What number is in the tens place?

Correct Answer: 0

Question 9:

What is 357 - 251? What number is in the ones place?

Correct Answer: 6

Question 10:

What is 357 - 251?

Correct Answer: 106

Fill in the Blank Questions

Question 1:

The number 357 has 3 ________.

Correct Answer: hundreds

Question 2:

The number 357 has 5 ________.

Correct Answer: tens

Question 3:

The number 357 has 7 ________.

Correct Answer: ones

Question 4:

In the number 123, the 1 is in the ________ place.

Correct Answer: hundreds

Question 5:

In the number 123, the 2 is in the ________ place.

Correct Answer: tens

Question 6:

In the number 123, the 3 is in the ________ place.

Correct Answer: ones

Question 7:

When we subtract, we take ________.

Correct Answer: away

Question 8:

In the problem 357 - 251, we subtract the ones from the ________ first.

Correct Answer: ones

Question 9:

357 - 251 = ________

Correct Answer: 106

Question 10:

When subtracting 3-digit numbers, we line up the numbers by their ________ ________.

Correct Answer: place value

Educational Standards

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. 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: 1.NBT.C.6:Subtract multiples of 10 in the range 10-90 from multiples of 10 in the range 10-90 (positive or zero differences), 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.

Teaching Materials

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