Adding Tens and Hundreds: Building Bigger Numbers!

Math Grades 1st Grade 3:58 Video
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Lesson Description

Learn how to add 10 or 100 to a number by understanding place value. Let's build bigger numbers together!

Video Resource

Adding ten or one hundred | Addition and subtraction within 100 | Early Math | Khan Academy

Khan Academy

Duration: 3:58
Watch on YouTube

Key Concepts

  • Place value (hundreds, tens, ones)
  • Adding tens
  • Adding hundreds

Learning Objectives

  • Students will be able to add 10 to a given number.
  • Students will be able to add 100 to a given number.
  • Students will understand how adding tens and hundreds affects the place value of a number.

Educator Instructions

  • Introduction (5 mins)
    Begin by reviewing place value. Ask students what the numbers in 235 mean (2 hundreds, 3 tens, and 5 ones). Use visual aids like base ten blocks if available.
  • Video Viewing (7 mins)
    Watch the Khan Academy video 'Adding ten or one hundred'. Pause at key points to ask comprehension questions.
  • Adding Tens Practice (10 mins)
    Present problems like 42 + 10 = ? and 153 + 10 = ?. Have students explain their reasoning. Use manipulatives if needed.
  • Adding Hundreds Practice (10 mins)
    Present problems like 235 + 100 = ? and 57 + 100 = ?. Again, encourage students to explain their thinking and use manipulatives as needed.
  • Wrap-up (3 mins)
    Review the key concepts. Ask students what happens when you add 10 or 100 to a number.

Interactive Exercises

  • Place Value Game
    Use base ten blocks. Call out a number (e.g., 36). Students build it. Then, say 'Add 10!' and students adjust the blocks to show the new number (46).
  • Number Line Addition
    Draw a number line on the board. Start at a number, and jump 10 or 100 spaces to show addition.

Discussion Questions

  • What happens to the tens place when you add 10?
  • What happens to the hundreds place when you add 100?
  • Why doesn't the ones place change when we add 10 or 100 in these examples?

Skills Developed

  • Place value understanding
  • Addition within 1000
  • Mental math

Multiple Choice Questions

Question 1:

What is 25 + 10?

Correct Answer: 35

Question 2:

What is 142 + 100?

Correct Answer: 242

Question 3:

If you have 67 blocks and add 10 more, how many do you have?

Correct Answer: 77

Question 4:

What place changes when you add 10 to a number?

Correct Answer: Tens

Question 5:

What is 300 + 100?

Correct Answer: 400

Question 6:

What is 56 + 10?

Correct Answer: 65

Question 7:

What is 230 + 100?

Correct Answer: 330

Question 8:

If you have 72 blocks and add 10 more, how many do you have?

Correct Answer: 82

Question 9:

What is 800 + 100?

Correct Answer: 900

Question 10:

Which number changes when we add 100 to the original number 345?

Correct Answer: Hundreds place

Fill in the Blank Questions

Question 1:

When you add 10 to 45, you get _____.

Correct Answer: 55

Question 2:

When you add 100 to 123, you get _____.

Correct Answer: 223

Question 3:

Adding 10 to 78 makes the _____ place bigger.

Correct Answer: tens

Question 4:

If I have 200 and add 100 more, I have _____.

Correct Answer: 300

Question 5:

44 + _____ = 54

Correct Answer: 10

Question 6:

200 + _____ = 300

Correct Answer: 100

Question 7:

_____ + 10 = 60

Correct Answer: 50

Question 8:

432 + _____ = 532

Correct Answer: 100

Question 9:

Adding 100 to 65 makes the _____ place change.

Correct Answer: hundreds

Question 10:

10 more than 55 is _____.

Correct Answer: 65

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.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.

Teaching Materials

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