Adding and Subtracting Fun with 10!

Math Grades 1st Grade 6:43 Video
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Lesson Description

Learn how to easily add and subtract 10 from numbers. We'll use fun examples and games to make math super easy and exciting!

Video Resource

Addition and Subtraction by 10 | Teaching Math for First Grade Kids Academy

Kids Academy

Duration: 6:43
Watch on YouTube

Key Concepts

  • Place Value (Tens and Ones)
  • Adding 10 increases the tens digit by one.
  • Subtracting 10 decreases the tens digit by one.

Learning Objectives

  • Students will be able to add 10 to a two-digit number.
  • Students will be able to subtract 10 from a two-digit number.
  • Students will be able to explain how adding or subtracting 10 changes the tens digit.

Educator Instructions

  • Introduction (5 mins)
    Start by asking students what they already know about adding and subtracting. Review the concepts of tens and ones place value. Ask questions like, 'What happens when we add one more to 9?'
  • Video Viewing (7 mins)
    Watch the Kids Academy video 'Addition and Subtraction by 10'. Encourage students to pay attention to how Teacher Mike explains adding and subtracting 10.
  • Guided Practice (10 mins)
    Work through examples on the board, similar to the video. Emphasize that when adding or subtracting 10, only the tens place changes. For example: 32 + 10 = 42, 58 - 10 = 48. Explain the reasoning: 'We are adding one group of ten, so only the tens place changes.'
  • Independent Practice (10 mins)
    Provide students with a worksheet containing addition and subtraction problems involving adding and subtracting 10 from two-digit numbers. Have them work individually to solve the problems.
  • Wrap Up (3 mins)
    Review the main concepts. Ask students to share what they learned and any tricks they discovered for adding and subtracting 10.

Interactive Exercises

  • Number Line Hop
    Use a number line to visually demonstrate adding and subtracting 10. Start at a number and hop 10 spaces forward (addition) or backward (subtraction).
  • Rocket Math Game (Adapted)
    Similar to the video, present equations written on paper rockets. Students check the rockets with correct sums or differences by writing a check mark on the rocket.

Discussion Questions

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

Skills Developed

  • Mental Math
  • Place Value Understanding
  • Problem-Solving

Multiple Choice Questions

Question 1:

What is 23 + 10?

Correct Answer: 33

Question 2:

What is 45 - 10?

Correct Answer: 35

Question 3:

If you have 67 and add 10, what number is in the tens place?

Correct Answer: 7

Question 4:

If you have 82 and take away 10, what number do you have?

Correct Answer: 72

Question 5:

Which number is 10 more than 59?

Correct Answer: 69

Question 6:

Which number is 10 less than 31?

Correct Answer: 21

Question 7:

What happens to the tens place when you add 10?

Correct Answer: It goes up

Question 8:

What happens to the tens place when you subtract 10?

Correct Answer: It goes down

Question 9:

What is 10 + 10?

Correct Answer: 20

Question 10:

If you have 99 and subtract 10, what number do you get?

Correct Answer: 89

Fill in the Blank Questions

Question 1:

25 + 10 = _______

Correct Answer: 35

Question 2:

50 - 10 = _______

Correct Answer: 40

Question 3:

10 more than 42 is _______

Correct Answer: 52

Question 4:

10 less than 78 is _______

Correct Answer: 68

Question 5:

33 + _______ = 43

Correct Answer: 10

Question 6:

61 - _______ = 51

Correct Answer: 10

Question 7:

Adding 10 makes the _______ place bigger.

Correct Answer: tens

Question 8:

Taking away 10 makes the _______ place smaller.

Correct Answer: tens

Question 9:

9 + 1 = _______ + 0

Correct Answer: 10

Question 10:

84 + 10 = _______

Correct Answer: 94

Educational Standards

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. 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

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