Beach Day Math: Counting by 2s and 10s!

Math Grades 1st Grade 6:37 Video
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Lesson Description

Let's learn to count by 2s and 10s using shells at the beach! We'll sing songs and make groups to practice our skip counting skills.

Video Resource

Grade 1: Math Lesson # 53 Counting by 10's and 2's AT THE BEACH!

The Eagle's Nest - Our Online Classroom

Duration: 6:37
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Key Concepts

  • Skip counting by 2s
  • Skip counting by 10s
  • Grouping objects into sets of ten

Learning Objectives

  • Students will be able to skip count by 2s to 24.
  • Students will be able to skip count by 10s to 120.
  • Students will be able to group objects into sets of ten and count the groups.

Educator Instructions

  • Introduction (5 mins)
    Begin by welcoming the students to the 'beach' (real or imaginary!). Review the concept of skip counting and introduce the idea of counting by 2s and 10s. Briefly mention that they will be using shells (or other objects) to help them count.
  • Counting by 2s (10 mins)
    Sing the skip counting by 2s song together (as in the video). Use shells (or other objects) to visually demonstrate counting by 2s. Start with 2 shells, then add 2 more, and so on, while saying the numbers aloud (2, 4, 6, 8...). Practice counting to 24.
  • Counting by 10s (10 mins)
    Explain that we will now count by 10s. Use the shells to make groups of 10. Count each group as 10, then count all the groups together (10, 20, 30...). Continue to 100 or 120. Sing the skip counting by 10s song. (Ten, Twenty, Thirty, Forty, Fifty, Sixty, Seventy, Eighty, Ninety, One Hundred, One Hundred Ten, One Hundred Twenty)
  • Practice and Application (10 mins)
    Provide students with more shells (or other manipulatives) and have them practice grouping them into sets of 2 and 10. Ask them to count the sets and write down the numbers.
  • Wrap-up (5 mins)
    Review the concepts of skip counting by 2s and 10s. Ask students to share what they learned and how they can use skip counting in their everyday lives. (e.g. Counting pairs of socks, counting allowance in dimes)

Interactive Exercises

  • Shell Grouping Game
    Provide each student with a set of shells (or other objects). Call out a number (e.g., 20). Students must quickly group the shells into sets of 10 (or 2) to reach that number.
  • Number Line Hop
    Use a number line (drawn on the board or floor). Have students hop along the number line, counting by 2s or 10s.

Discussion Questions

  • What are some things you can count by 2s?
  • What are some things you can count by 10s?
  • Why is skip counting helpful?

Skills Developed

  • Skip counting
  • Number recognition
  • Grouping and classifying
  • Problem solving

Multiple Choice Questions

Question 1:

What comes after 2 when we count by 2s?

Correct Answer: 4

Question 2:

What comes after 10 when we count by 10s?

Correct Answer: 20

Question 3:

If you have 2 groups of 10 shells, how many shells do you have?

Correct Answer: 20

Question 4:

Which of these numbers do we say when we count by 2s?

Correct Answer: 6

Question 5:

Which of these numbers do we say when we count by 10s?

Correct Answer: 30

Question 6:

What number is missing? 2, 4, __, 8, 10

Correct Answer: 6

Question 7:

What number is missing? 10, 20, 30, __, 50

Correct Answer: 40

Question 8:

How many shells are in 3 groups of 10?

Correct Answer: 30

Question 9:

If you have 8 shells and you want to count by 2s, how many groups of 2 can you make?

Correct Answer: 4

Question 10:

If you have 22 shells, is that more or less than counting to 10 by 2s?

Correct Answer: More

Fill in the Blank Questions

Question 1:

2, 4, 6, 8, ____

Correct Answer: 10

Question 2:

10, 20, 30, ____

Correct Answer: 40

Question 3:

When we count by 2s, we _____ 2 each time.

Correct Answer: add

Question 4:

When we count by 10s, we _____ 10 each time.

Correct Answer: add

Question 5:

Two groups of ten is equal to ____.

Correct Answer: 20

Question 6:

2, ___, 6, 8, 10

Correct Answer: 4

Question 7:

10, 20, ___, 40, 50

Correct Answer: 30

Question 8:

The number that comes after 18 when counting by twos is ____.

Correct Answer: 20

Question 9:

Five groups of 10 is equal to ____.

Correct Answer: 50

Question 10:

Ten, Twenty, Thirty, Forty, Fifty, _________, Seventy, Eighty, Ninety, One Hundred

Correct Answer: Sixty

Educational Standards

CCSS.Math.Content.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. CCSS.Math.Content.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). CCSS.Math.Content.1.OA.C.5:Relate counting to addition and subtraction (e.g., by counting on 2 to add 2).

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