Teens as Tens and Ones: Unlocking Place Value!

Math Grades 1st Grade 3:00 Video
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Lesson Description

Let's learn how teen numbers are made up of tens and ones! We'll see how the number 10 is hiding inside numbers like 11, 12, 13, and so on. Get ready to become a number detective!

Video Resource

Teens as sums with 10 | Place value (tens and hundreds) | Early Math | Khan Academy

Khan Academy

Duration: 3:00
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Key Concepts

  • Place value: understanding that the position of a digit in a number determines its value.
  • Tens and ones: recognizing that teen numbers are composed of one ten and some ones.
  • Decomposition: breaking down teen numbers into 10 + a single-digit number.

Learning Objectives

  • Students will be able to identify the 'ten' in teen numbers (11-19).
  • Students will be able to decompose teen numbers into the sum of 10 and another number (e.g., 15 = 10 + 5).
  • Students will be able to represent teen numbers using objects to show the 'ten' and the 'ones'.

Educator Instructions

  • Introduction (5 mins)
    Begin by counting from 0 to 19 as a class. Ask students what they notice about the numbers 10-19. Guide them to observe that they all start with '1'. Explain that today we will learn what that '1' really means in those numbers.
  • Video Viewing (5 mins)
    Watch the Khan Academy video "Teens as sums with 10 | Place value (tens and hundreds) | Early Math | Khan Academy". Pause at key moments, like when the instructor shows 11 = 10 + 1, to ask students what they see.
  • Hands-On Activity: Building Teen Numbers (15 mins)
    Give each student a set of ten blocks/counters connected as a train (representing one 'ten') and some single blocks/counters (representing 'ones'). Call out a teen number (e.g., 14). Have students use their blocks to represent the number. They should place the 'ten' train and then the appropriate number of single blocks. Then have them write the equation on a small whiteboard: 14 = 10 + 4. Repeat with different teen numbers.
  • Worksheet Practice (10 mins)
    Provide a worksheet with pictures of teen numbers represented by objects (e.g., a group of ten apples and then some single apples). Students write the corresponding equation (e.g., 16 = 10 + 6).
  • Wrap-Up (5 mins)
    Review the key concept: Teen numbers have one ten and some ones. Ask students to share their favorite teen number and explain how it's made of tens and ones.

Interactive Exercises

  • Number Splitting Game
    Call out a teen number. Students clap their hands once for the 'ten' and then clap the number of 'ones' (e.g., for 17, they clap once, then clap seven times). This reinforces the concept in a fun, active way.

Discussion Questions

  • What does the number '1' mean in the number 15? Does it mean one?
  • How many 'ones' are in the number 12?
  • Why is it helpful to know that teen numbers have a 'ten' inside them?

Skills Developed

  • Understanding place value
  • Number decomposition
  • Addition within 20
  • Representational thinking

Multiple Choice Questions

Question 1:

Which number is the same as 10 + 3?

Correct Answer: 13

Question 2:

The number 15 is made of 10 and how many more?

Correct Answer: 5

Question 3:

Which number has one ten and seven ones?

Correct Answer: 17

Question 4:

What is 10 + 8?

Correct Answer: 18

Question 5:

Which of these shows how to make 12?

Correct Answer: 10 + 2

Question 6:

How many tens are in the number 19?

Correct Answer: 1

Question 7:

Which number is made of 10 and 6?

Correct Answer: 16

Question 8:

What does the 1 in 11 mean?

Correct Answer: ten

Question 9:

Which equation is right?

Correct Answer: 13 = 10 + 3

Question 10:

If you have 10 blocks and want to make 14, how many more blocks do you need?

Correct Answer: 4

Fill in the Blank Questions

Question 1:

The number 16 is 10 + ______.

Correct Answer: 6

Question 2:

10 + 4 = ______

Correct Answer: 14

Question 3:

The 1 in 18 means 1 ______.

Correct Answer: ten

Question 4:

10 + ______ = 17

Correct Answer: 7

Question 5:

15 = 10 + ______

Correct Answer: 5

Question 6:

The number 11 has one ten and ______ one.

Correct Answer: 1

Question 7:

10 + 9 = ______

Correct Answer: 19

Question 8:

To make 12, you need 10 and ______ more.

Correct Answer: 2

Question 9:

In the number 13, the 3 means 3 ______.

Correct Answer: ones

Question 10:

______ + 8 = 18

Correct Answer: 10

Educational Standards

CCSS.Math.Content.1.NBT.B.2.B:The numbers from 11 to 19 are composed of a ten and one, two, three, four, five, six, seven, eight, or nine ones. 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). CCSS.Math.Content.1.OA.D.7:Understand the meaning of the equal sign, and determine if equations involving addition and subtraction are true or false. For example, which of the following equations are true and which are false? 6 = 6, 7 = 8 - 1, 5 + 2 = 2 + 5, 4 + 1 = 5 + 2.

Teaching Materials

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