Super Subtraction with Hundreds, Tens, and Ones!

Math Grades 1st Grade 3:11 Video
Print Lesson Plan Watch Video

Lesson Description

Learn how to subtract big numbers by taking away ones, tens, and hundreds, just like in the video! We'll use blocks and drawings to make it super easy.

Video Resource

Subtracting hundreds, tens, and ones | Early Math | Khan Academy

Khan Academy

Duration: 3:11
Watch on YouTube

Key Concepts

  • Place Value (Hundreds, Tens, Ones)
  • Subtraction as Taking Away
  • Subtracting Hundreds, Tens, and Ones Separately

Learning Objectives

  • Students will be able to identify the place value of digits in a three-digit number.
  • Students will be able to subtract three-digit numbers by subtracting the ones, tens, and hundreds separately.
  • Students will be able to use visual aids (drawings or blocks) to represent subtraction of three-digit numbers.

Educator Instructions

  • Introduction (5 mins)
    Begin by reviewing place value. Ask students: 'What does the number 235 mean? How many hundreds, tens, and ones are there?' Use blocks or drawings to represent numbers and reinforce the concept.
  • Video Viewing (7 mins)
    Watch the Khan Academy video 'Subtracting hundreds, tens, and ones | Early Math | Khan Academy'. Pause at key points to ask clarifying questions, such as 'What is he taking away first?' or 'Why is he subtracting the hundreds first?'
  • Guided Practice (10 mins)
    Work through a subtraction problem together on the board (e.g., 547 - 231). Guide students to subtract the ones, then the tens, then the hundreds. Use drawings of blocks or base-ten blocks to visually represent the subtraction process.
  • Independent Practice (10 mins)
    Provide students with 2-3 similar subtraction problems to solve independently. Encourage them to draw pictures or use blocks to help. Circulate to provide support and answer questions.
  • Wrap-up (3 mins)
    Review the main concepts of the lesson. Ask students to explain in their own words how to subtract three-digit numbers by place value.

Interactive Exercises

  • Place Value Subtraction Game
    Use base-ten blocks or drawings. Give students a subtraction problem. Have them physically remove the blocks or cross out the drawings to represent the subtraction. For example: 'Start with 325. Take away 1 hundred, 2 tens, and 3 ones. What do you have left?'

Discussion Questions

  • Why is it important to understand place value when we subtract?
  • Can you explain how we subtract the ones, tens, and hundreds separately?
  • How can drawing pictures help us with subtraction?

Skills Developed

  • Place Value Understanding
  • Subtraction Skills
  • Visual Representation of Math Problems

Multiple Choice Questions

Question 1:

What does the number 234 mean?

Correct Answer: 2 hundreds, 3 tens, 4 ones

Question 2:

In the number 678, which number is in the hundreds place?

Correct Answer: 6

Question 3:

What is 5 - 2?

Correct Answer: 3

Question 4:

If you have 4 tens and take away 1 ten, how many tens are left?

Correct Answer: 3

Question 5:

What do we take away FIRST when we subtract hundreds, tens, and ones?

Correct Answer: Ones

Question 6:

What is 8 - 4?

Correct Answer: 4

Question 7:

If you start with 200 and take away 100, how much do you have left?

Correct Answer: 100

Question 8:

In the problem 456 - 123, what do you subtract in the ones place?

Correct Answer: 6 - 3

Question 9:

What number comes RIGHT AFTER 123?

Correct Answer: 124

Question 10:

How many tens are in the number 58?

Correct Answer: 5

Fill in the Blank Questions

Question 1:

When we subtract, we are ______ away.

Correct Answer: taking

Question 2:

The number 325 has 3 ________.

Correct Answer: hundreds

Question 3:

The number 89 has 9 ________.

Correct Answer: ones

Question 4:

In the number 456, the 5 is in the ______ place.

Correct Answer: tens

Question 5:

100 is one ________.

Correct Answer: hundred

Question 6:

When we subtract hundreds, tens and ones, we subtract the _______ first.

Correct Answer: ones

Question 7:

If you have 7 tens, that is the same as the number _______.

Correct Answer: 70

Question 8:

If you have 5 hundreds, that is the same as the number _______.

Correct Answer: 500

Question 9:

Taking away is also called ________.

Correct Answer: subtracting

Question 10:

The answer to a subtraction problem is called the ________.

Correct Answer: difference

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: 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

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