Adding and Subtracting by 10s and 100s with Base Ten Blocks

Mathematics Grades 1st Grade 3:04 Video
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Lesson Description

Learn how to add and subtract 10s and 100s using base ten blocks. This lesson uses a fun song to help you understand how the ones, tens, and hundreds places change!

Video Resource

Adding and Subtracting by 10 and 100 Song | With Base 10 Blocks

Math Songs by NUMBEROCK

Duration: 3:04
Watch on YouTube

Key Concepts

  • Base Ten Blocks (ones, tens, hundreds)
  • Adding and Subtracting 10
  • Adding and Subtracting 100
  • Place Value

Learning Objectives

  • Students will be able to add and subtract 10 from a given number using base ten blocks.
  • Students will be able to add and subtract 100 from a given number using base ten blocks.
  • Students will understand that when adding or subtracting 10, the ones place remains the same.
  • Students will understand that when adding or subtracting 100, the ones and tens places remain the same.

Educator Instructions

  • Introduction (5 mins)
    Begin by asking students what they know about base ten blocks. Show them examples of ones, tens, and hundreds blocks. Explain that today they will be using these blocks and a song to learn how to add and subtract 10s and 100s.
  • Video Viewing (3 mins)
    Play the NUMBEROCK video "Adding and Subtracting by 10 and 100 Song | With Base 10 Blocks." Encourage students to sing along and pay attention to how the base ten blocks are used.
  • Guided Practice (10 mins)
    After the video, work through examples on the board using base ten blocks (either physical or drawn). Start with a number like 34. Add 10 by adding a ten block. Ask students what the new number is (44). Repeat the process subtracting 10. Then, do the same with adding and subtracting 100, starting with a number like 125.
  • Independent Practice (10 mins)
    Give each student a set of base ten blocks (or have them draw them on paper). Provide a worksheet with problems like: * 23 + 10 = ? * 56 - 10 = ? * 142 + 100 = ? * 289 - 100 = ?
  • Wrap Up (2 mins)
    Review the key concepts: when adding or subtracting 10, the ones place stays the same; when adding or subtracting 100, the ones and tens places stay the same.

Interactive Exercises

  • Base Ten Block Building
    Give students a number (e.g., 67) and have them build it using base ten blocks. Then, tell them to add or subtract 10 or 100 and rebuild the number.
  • Number Line Jumps
    Use a number line to visually represent adding and subtracting 10 and 100. Start at a number and 'jump' 10 or 100 spaces forward or backward.

Discussion Questions

  • What happens to the ones place when you add or subtract 10?
  • What happens to the ones and tens places when you add or subtract 100?
  • Can you think of a time when you might need to add or subtract 10 or 100 in real life?

Skills Developed

  • Addition and Subtraction
  • Place Value Understanding
  • Problem Solving

Multiple Choice Questions

Question 1:

What is 25 + 10?

Correct Answer: 35

Question 2:

What is 48 - 10?

Correct Answer: 38

Question 3:

What is 120 + 100?

Correct Answer: 220

Question 4:

What is 350 - 100?

Correct Answer: 250

Question 5:

If you have 32 and add one ten, what number do you have?

Correct Answer: 42

Question 6:

If you have 78 and take away one ten, what number do you have?

Correct Answer: 68

Question 7:

If you have 155 and add one hundred, what number do you have?

Correct Answer: 255

Question 8:

If you have 432 and take away one hundred, what number do you have?

Correct Answer: 332

Question 9:

When we add or subtract just 10, which place stays the same?

Correct Answer: Ones Place

Question 10:

When we add or subtract just 100, which places stay the same?

Correct Answer: Ones and Tens Places

Fill in the Blank Questions

Question 1:

20 + 10 = ____

Correct Answer: 30

Question 2:

65 - 10 = ____

Correct Answer: 55

Question 3:

115 + 100 = ____

Correct Answer: 215

Question 4:

470 - 100 = ____

Correct Answer: 370

Question 5:

Adding ten is like adding one _____ block.

Correct Answer: ten

Question 6:

Taking away one hundred is like taking away one _____ block.

Correct Answer: hundred

Question 7:

In the number 23, the 2 is in the _____ place.

Correct Answer: tens

Question 8:

In the number 145, the 5 is in the _____ place.

Correct Answer: ones

Question 9:

When we add or subtract only tens, the _____ place stays the same.

Correct Answer: ones

Question 10:

When we add or subtract only hundreds, the _____ and _____ places stay the same.

Correct Answer: ones,tens

Educational Standards

1.N.1.2:Use concrete representations to describe whole numbers between 10 and 100 in terms of tens and ones. Know that 10 is equivalent to 10 ones and 100 is equivalent to 10 tens. 1.N.1.6:Find a number that is 10 more or 10 less than a given number up to 100.

Teaching Materials

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