Adding Tens with Place Value!

Math Grades 1st Grade 3:15 Video
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Lesson Description

Learn how to add tens to two-digit numbers by understanding place value. We'll use blocks to see how tens and ones work together!

Video Resource

Understanding place value while adding tens | Early Math | Khan Academy

Khan Academy

Duration: 3:15
Watch on YouTube

Key Concepts

  • Place value (tens and ones)
  • Adding tens to a two-digit number
  • Representing numbers with blocks

Learning Objectives

  • Students will be able to identify the tens and ones digits in a two-digit number.
  • Students will be able to add multiples of 10 to a two-digit number using place value understanding.
  • Students will be able to represent addition problems using blocks (drawings or manipulatives).

Educator Instructions

  • Introduction (5 mins)
    Start by reviewing place value. Ask students what the numbers 10, 20, 30, 40 and 50 mean. Show them blocks of ten and individual blocks to represent these numbers.
  • Video Time (7 mins)
    Play the Khan Academy video: 'Understanding place value while adding tens'. Ask students to pay attention to how the blocks are used to show the numbers.
  • Practice with Blocks (10 mins)
    Give each student (or pair of students) blocks of ten and individual blocks. Have them represent numbers like 23, 41, 35. Then, have them add 30 to each number and show how the blocks change. For instance, 23 + 30. They should start with 2 tens and 3 ones, then add 3 more tens. What do they have now?
  • Worksheet Activity (10 mins)
    Provide a worksheet with addition problems like 14 + 20, 25 + 40, 32 + 10. Have students solve the problems by drawing blocks or writing out the tens and ones.
  • Wrap-up (3 mins)
    Review the main points of the lesson. Ask students to explain in their own words how to add tens to a two-digit number using place value.

Interactive Exercises

  • Place Value Bingo
    Create bingo cards with numbers like 23, 45, 17, etc. Call out '2 tens and 3 ones', and students mark the corresponding number. The first to get bingo wins!
  • Adding Tens Game
    Use a number line or a hundreds chart. Start at a number and roll a die (or use a spinner) to determine how many tens to add. Students move along the number line or chart to find the answer.

Discussion Questions

  • What does the number 2 in 23 really mean?
  • How are the blocks of ten helping us add?
  • Can you think of a time when you might need to add tens to a number in real life?

Skills Developed

  • Understanding place value
  • Addition
  • Problem-solving
  • Visual Representation

Multiple Choice Questions

Question 1:

What does the 2 in 25 mean?

Correct Answer: 2 tens

Question 2:

What is 10 + 20?

Correct Answer: 30

Question 3:

What is 34 + 20?

Correct Answer: 54

Question 4:

Which number has 4 tens?

Correct Answer: 41

Question 5:

If you have 1 ten and 7 ones, what number do you have?

Correct Answer: 17

Question 6:

What is 23 + 10?

Correct Answer: 33

Question 7:

If you have 5 tens, what number do you have?

Correct Answer: 50

Question 8:

What is 46 + 30?

Correct Answer: 76

Question 9:

Which number has 3 ones?

Correct Answer: 13

Question 10:

What is 11 + 40?

Correct Answer: 51

Fill in the Blank Questions

Question 1:

In the number 32, there are ___ tens.

Correct Answer: 3

Question 2:

10 + 10 = ____

Correct Answer: 20

Question 3:

24 + 10 = ____

Correct Answer: 34

Question 4:

The number 40 has ____ tens.

Correct Answer: 4

Question 5:

36 + 20 = ____

Correct Answer: 56

Question 6:

In the number 18, there are 8 ____.

Correct Answer: ones

Question 7:

15 + 30 = ____

Correct Answer: 45

Question 8:

The number 50 has ____ ones.

Correct Answer: 0

Question 9:

42 + 10 = ____

Correct Answer: 52

Question 10:

Adding 10 means you add 1 ____.

Correct Answer: ten

Educational Standards

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. 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.OA.A.1:Use addition and subtraction within 20 to solve word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions, e.g., by using objects, drawings, and equations with a symbol for the unknown number to represent the problem.

Teaching Materials

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