Subtraction Superstars: Subtracting Two and Three-Digit Numbers!

Math Grades 1st Grade 3:39 Video
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Lesson Description

Let's learn how to subtract two and three-digit numbers without needing to regroup! We'll practice lining up our numbers and subtracting each place value.

Video Resource

How to Subtract Multi-digit Numbers Without Regrouping

Miacademy Learning Channel

Duration: 3:39
Watch on YouTube

Key Concepts

  • Place Value (Ones, Tens, Hundreds)
  • Subtraction
  • Lining up numbers correctly

Learning Objectives

  • Students will be able to subtract two-digit numbers without regrouping.
  • Students will be able to subtract three-digit numbers without regrouping.
  • Students will be able to correctly align numbers based on place value before subtracting.

Educator Instructions

  • Introduction (5 mins)
    Begin by reviewing place value (ones, tens, hundreds). Ask students what each place represents. Example: What does the 3 in 36 mean? (3 tens). Show example problems on the board and have the students come up and identify the place value.
  • Video Viewing (5 mins)
    Watch the Miacademy Learning Channel video: 'How to Subtract Multi-digit Numbers Without Regrouping'. Encourage students to pay attention to how the numbers are lined up and the steps for subtracting.
  • Guided Practice (10 mins)
    Work through several subtraction problems on the board with the students, emphasizing the importance of lining up the numbers correctly. Start with two-digit subtraction and then move to three-digit subtraction. Have students come up and solve problems.
  • Independent Practice (10 mins)
    Provide students with a worksheet containing subtraction problems (two and three-digit without regrouping). Have them work independently. Circulate to provide assistance as needed.
  • Wrap-up (5 mins)
    Review the key concepts of place value and lining up numbers. Ask students to share any challenges they faced and how they overcame them.

Interactive Exercises

  • Place Value Game
    Use place value blocks (ones, tens, hundreds) to represent the numbers being subtracted. This will help students visualize the subtraction process.
  • Subtraction Race
    Divide the class into teams. Write subtraction problems on the board. The first team to correctly solve the problem wins a point.

Discussion Questions

  • Why is it important to line up the numbers correctly when subtracting?
  • What happens if we don't line up the numbers in the right place value?
  • Can you explain how to subtract starting with the ones place?

Skills Developed

  • Subtraction skills
  • Understanding of place value
  • Problem-solving

Multiple Choice Questions

Question 1:

What place do we start subtracting in?

Correct Answer: Ones

Question 2:

Which number is in the tens place in 42?

Correct Answer: 4

Question 3:

Which of these shows the correct way to line up 23 - 2?

Correct Answer: 23 - 2

Question 4:

What is 6 - 3?

Correct Answer: 3

Question 5:

What is 8 - 0?

Correct Answer: 8

Question 6:

What is 1 - 1?

Correct Answer: 0

Question 7:

What place comes AFTER the ones place?

Correct Answer: Tens

Question 8:

In the number 123, which number is in the hundreds place?

Correct Answer: 1

Question 9:

What is 9 - 4?

Correct Answer: 5

Question 10:

Why do we line up the numbers to subtract?

Correct Answer: To subtract the correct place values

Fill in the Blank Questions

Question 1:

We always start subtracting on the ____.

Correct Answer: right

Question 2:

The first place value is called the ____ place.

Correct Answer: ones

Question 3:

The second place value is called the ____ place.

Correct Answer: tens

Question 4:

The third place value is called the ____ place.

Correct Answer: hundreds

Question 5:

4 - 2 = ____

Correct Answer: 2

Question 6:

It is important to ____ up the numbers to subtract correctly.

Correct Answer: line

Question 7:

If you subtract 0 from a number, the number stays the ____.

Correct Answer: same

Question 8:

When subtracting, we take ____ from a number.

Correct Answer: away

Question 9:

The answer to a subtraction problem is called the ____.

Correct Answer: difference

Question 10:

5 - ____ = 3

Correct Answer: 2

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. 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: 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.

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