Adding Fun with 1 and 10!

Math Grades 1st Grade 2:16 Video
Print Lesson Plan Watch Video

Lesson Description

Learn how adding 1 and adding 10 changes numbers using place value!

Video Resource

Adding 1 vs. adding 10 | Addition and subtraction | 1st grade | Khan Academy

Khan Academy

Duration: 2:16
Watch on YouTube

Key Concepts

  • Place Value (Tens and Ones)
  • Adding 1 (Increases the ones place)
  • Adding 10 (Increases the tens place)

Learning Objectives

  • Students will be able to identify the tens and ones place in a two-digit number.
  • Students will be able to add 1 to a two-digit number and explain how it affects the ones place.
  • Students will be able to add 10 to a two-digit number and explain how it affects the tens place.

Educator Instructions

  • Introduction (5 mins)
    Begin by asking students what they know about the numbers 1-99. Ask students about the numbers 10, 20, 30, 40, 50, 60, 70, 80, 90. Briefly review the concept of tens and ones using visual aids like base-ten blocks or drawings of tens and ones.
  • Video Viewing (5 mins)
    Play the Khan Academy video: 'Adding 1 vs. adding 10'. Ask students to pay attention to how Sal explains the difference between adding 1 and adding 10 using place value.
  • Discussion (5 mins)
    After the video, ask students what they learned. Guide the discussion to focus on the main points: Adding 1 changes the ones place, while adding 10 changes the tens place.
  • Practice with Manipulatives (10 mins)
    Provide students with base-ten blocks (or drawings). Have them represent a two-digit number, like 34. Then, ask them to add 1. What changes? Now, ask them to add 10 to the original number (34). What changes now? Repeat with different numbers.
  • Worksheet Activity (10 mins)
    Distribute a worksheet with addition problems involving adding 1 and adding 10 to two-digit numbers. Have students solve the problems and explain their reasoning.

Interactive Exercises

  • Number Line Hop
    Use a number line. Start at a number and hop forward 1 space (adding 1). Then, start at a different number and hop forward 10 spaces (adding 10). Discuss the different distances.
  • Place Value Chart Game
    Create a place value chart (Tens, Ones). Call out a number (e.g., 42). Students write it on their chart. Then, call out '+1' or '+10'. Students adjust their chart and write the new number.

Discussion Questions

  • What happens to a number when you add 1 to it?
  • What happens to a number when you add 10 to it?
  • How is adding 1 different from adding 10?
  • Can you give an example of when you might need to add 1 or 10 in real life?

Skills Developed

  • Place Value Understanding
  • Addition Skills
  • Problem-Solving
  • Critical Thinking

Multiple Choice Questions

Question 1:

What is 1 more than 25?

Correct Answer: 26

Question 2:

What is 10 more than 32?

Correct Answer: 42

Question 3:

Which number changes when you add 1 to 19?

Correct Answer: The nine

Question 4:

Which number changes when you add 10 to 53?

Correct Answer: The five

Question 5:

What is 47 + 1?

Correct Answer: 48

Question 6:

What is 61 + 10?

Correct Answer: 71

Question 7:

If you have 14 cookies and get 1 more, how many do you have?

Correct Answer: 15

Question 8:

If you have 28 stickers and get 10 more, how many do you have?

Correct Answer: 38

Question 9:

Adding 1 changes the _____ place.

Correct Answer: Ones

Question 10:

Adding 10 changes the _____ place.

Correct Answer: Tens

Fill in the Blank Questions

Question 1:

23 + 1 = _____

Correct Answer: 24

Question 2:

45 + 10 = _____

Correct Answer: 55

Question 3:

1 more than 39 is _____.

Correct Answer: 40

Question 4:

10 more than 62 is _____.

Correct Answer: 72

Question 5:

The number 15 has 1 ____ and 5 ones.

Correct Answer: ten

Question 6:

The number 70 has 7 _____ and 0 ones.

Correct Answer: tens

Question 7:

When you add 1, the number gets _____

Correct Answer: bigger

Question 8:

When you add 10, the number gets much _____

Correct Answer: bigger

Question 9:

9 + 1 = _____

Correct Answer: 10

Question 10:

30 + 10 = _____

Correct Answer: 40

Educational Standards

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: 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.OA.C.6:Add and subtract within 20, demonstrating fluency for addition and subtraction within 10. Use strategies such as counting on; making ten (e.g., 8 + 6 = 8 + 2 + 4 = 10 + 4 = 14); decomposing a number leading to a ten (e.g., 13 - 4 = 13 - 3 - 1 = 10 - 1 = 9); using the relationship between addition and subtraction (e.g., knowing that 8 + 4 = 12, one knows 12 - 8 = 4); and creating equivalent but easier or known sums (e.g., adding 6 + 7 by creating the known equivalent 6 + 6 + 1 = 12 + 1 = 13).

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