Let's Count by Tens!

Math Grades 1st Grade 2:35 Video
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Lesson Description

Learn to count by tens and understand how adding ten changes the numbers. We will practice counting forward by tens, starting from different numbers.

Video Resource

Counting by tens examples | Addition and subtraction within 100 | Early Math | Khan Academy

Khan Academy

Duration: 2:35
Watch on YouTube

Key Concepts

  • Counting by tens
  • Place value (tens and ones)
  • Adding 10 to a number

Learning Objectives

  • Students will be able to count forward by tens from a given number.
  • Students will be able to identify the number that is 10 more than a given number.
  • Students will understand that adding 10 increases the tens place by one.

Educator Instructions

  • Introduction (5 mins)
    Begin by asking students what they already know about counting. Can they count to 10? Can they count by 2s or 5s? Introduce the idea of counting by tens, explaining that it's like having groups of ten.
  • Video Viewing (7 mins)
    Play the Khan Academy video "Counting by tens examples | Addition and subtraction within 100 | Early Math | Khan Academy". Encourage students to follow along and try to answer the questions posed in the video.
  • Guided Practice (10 mins)
    After the video, work through some examples together on the board. Start with simple examples like counting by tens from 10, then move to starting from other numbers like 23 or 45. Emphasize how only the tens place changes.
  • Independent Practice (10 mins)
    Give students worksheets with number sequences where they have to fill in the missing numbers by counting by tens. Also include problems where they are asked to find the number that is 10 more than a given number.
  • Wrap-up (3 mins)
    Review what was learned and ask students if they have any questions. Play a quick counting by tens game as a class (e.g., going around the room and each student says the next number when counting by tens).

Interactive Exercises

  • Number Line Counting
    Use a large number line and have students physically jump or point to numbers as they count by tens.
  • Ten Frame Activity
    Use ten frames to visually represent adding ten. Start with a number and then add another ten frame to see the resulting number.

Discussion Questions

  • What happens to the number when we add 10?
  • Can you think of real-life situations where we might count by tens?
  • Is counting by tens easier or harder than counting by ones? Why?

Skills Developed

  • Counting skills
  • Number sense
  • Problem-solving

Multiple Choice Questions

Question 1:

What number comes after 20 when you count by tens?

Correct Answer: 30

Question 2:

What is 10 more than 45?

Correct Answer: 55

Question 3:

Which of these numbers do we say when counting by tens?

Correct Answer: 30

Question 4:

If you have 60 cookies and add 10 more, how many cookies do you have?

Correct Answer: 70

Question 5:

What number is missing: 30, 40, ____, 60?

Correct Answer: 50

Question 6:

Which is the biggest number: 70, 50, or 20?

Correct Answer: 70

Question 7:

10 more than 82 is:

Correct Answer: 92

Question 8:

Which number comes right before 40 when counting by tens?

Correct Answer: 30

Question 9:

What is ten more than the number of fingers on your hands?

Correct Answer: 20

Question 10:

If you start at 10 and count by tens three times, what number do you get to?

Correct Answer: 40

Fill in the Blank Questions

Question 1:

10, 20, 30, ____

Correct Answer: 40

Question 2:

10 more than 56 is ____

Correct Answer: 66

Question 3:

Sixty is the same as ____ tens.

Correct Answer: 6

Question 4:

70, 80, ____, 100

Correct Answer: 90

Question 5:

Ten more than 20 is ____.

Correct Answer: 30

Question 6:

When we count by tens, we add ____ each time.

Correct Answer: 10

Question 7:

90 is ____ more than 80.

Correct Answer: 10

Question 8:

If you count by tens, the number after 40 is ____.

Correct Answer: 50

Question 9:

The number that has 3 tens is ____.

Correct Answer: 30

Question 10:

25, 35, ____, 55

Correct Answer: 45

Educational Standards

1.NBT.A.1:Count to 120, starting at any number less than 120. In this range, read and write numerals and represent a number of objects with a written numeral. 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. 1.NBT.B.2.C:The numbers 10, 20, 30, 40, 50, 60, 70, 80, 90 refer to one, two, three, four, five, six, seven, eight, or nine tens (and 0 ones).

Teaching Materials

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