Adding Ones with Place Value: Let's Count!

Math Grades 1st Grade 2:35 Video
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Lesson Description

Learn how to add small numbers to bigger numbers by understanding place value. We'll see how ones and tens work together!

Video Resource

Understanding place value when adding ones | Early Math | Khan Academy

Khan Academy

Duration: 2:35
Watch on YouTube

Key Concepts

  • Place Value (Tens and Ones)
  • Adding Ones
  • Representing Numbers with Tens and Ones

Learning Objectives

  • Students will be able to identify the tens and ones digits in a two-digit number.
  • Students will be able to add a one-digit number to a two-digit number by focusing on the ones place.
  • Students will be able to represent addition using models of tens and ones.

Educator Instructions

  • Introduction (5 mins)
    Begin by reviewing what tens and ones are. Use blocks or drawings to show examples of numbers like 10, 20, 30, 1, 2, 3, etc. Ask students to identify the tens and ones in numbers like 12, 25, and 31.
  • Video Viewing (7 mins)
    Watch the Khan Academy video 'Understanding place value when adding ones | Early Math | Khan Academy' together as a class. Pause at key points to ask questions and ensure understanding.
  • Guided Practice (10 mins)
    Work through a few examples similar to the video on the board. For example: 23 + 4, 41 + 5, 16 + 2. Use drawings of tens and ones to represent the numbers and show how adding ones changes the number.
  • Independent Practice (10 mins)
    Give students a worksheet with similar addition problems to solve on their own. Provide manipulatives (blocks, counters) for them to use if needed. Encourage them to draw pictures of tens and ones to help them solve the problems.
  • Wrap-up (3 mins)
    Review the key concepts and answer any remaining questions. Have students share their strategies for adding ones and how they use place value to help them.

Interactive Exercises

  • Tens and Ones Game
    Use online interactive tools or physical manipulatives to play a game where students identify the tens and ones in different numbers. Then, have them add a one-digit number and identify the new number.
  • Draw It Out!
    Give students addition problems and have them draw pictures of tens and ones to solve them. This reinforces the visual representation of place value.

Discussion Questions

  • What happens when we add ones to a number?
  • How does knowing about tens and ones help us add?
  • Can you think of a time you used adding ones in real life?

Skills Developed

  • Understanding Place Value
  • Addition
  • Problem-Solving

Multiple Choice Questions

Question 1:

In the number 24, how many TENS are there?

Correct Answer: 2

Question 2:

In the number 31, how many ONES are there?

Correct Answer: 1

Question 3:

What is 13 + 2?

Correct Answer: 15

Question 4:

What is 26 + 3?

Correct Answer: 29

Question 5:

Which number shows 3 TENS and 5 ONES?

Correct Answer: 35

Question 6:

Which number shows 1 TEN and 8 ONES?

Correct Answer: 18

Question 7:

What is 42 + 6?

Correct Answer: 48

Question 8:

What is 11 + 5?

Correct Answer: 16

Question 9:

If you have 2 TENS and add 4 ONES, what number do you have?

Correct Answer: 24

Question 10:

If you have 33 and add 5, what number do you have?

Correct Answer: 38

Fill in the Blank Questions

Question 1:

The number 10 has 1 _____ and 0 ones.

Correct Answer: ten

Question 2:

In the number 47, the 4 is in the _____ place.

Correct Answer: tens

Question 3:

20 + 5 = _____

Correct Answer: 25

Question 4:

12 + 3 = _____

Correct Answer: 15

Question 5:

If you have 3 tens and 2 ones, you have the number _____

Correct Answer: 32

Question 6:

Adding ones only changes the _____ place.

Correct Answer: ones

Question 7:

34 + 4 = _____

Correct Answer: 38

Question 8:

If you have 1 ten and 6 ones, you have the number _____

Correct Answer: 16

Question 9:

21 + 7 = _____

Correct Answer: 28

Question 10:

The number 9 only has _____.

Correct Answer: ones

Educational Standards

1.NBT.C.4:Add within 100, including adding a two-digit number and a one-digit number, 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

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