Adding Fun with Regrouping!

Math Grades 1st Grade 4:35 Video
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Lesson Description

Learn how to add two-digit numbers using blocks and regrouping, just like in the Khan Academy video!

Video Resource

Addition with regrouping | Addition and subtraction within 100 | Early Math | Khan Academy

Khan Academy

Duration: 4:35
Watch on YouTube

Key Concepts

  • Place Value (Tens and Ones)
  • Regrouping (Making a ten)
  • Addition

Learning Objectives

  • Students will be able to identify the tens and ones place in a two-digit number.
  • Students will be able to add two-digit numbers with regrouping using visual aids (blocks).
  • Students will be able to explain the process of regrouping in their own words.

Educator Instructions

  • Introduction (5 mins)
    Begin by asking students what they already know about adding numbers. Review the concept of place value (tens and ones) using base-ten blocks or drawings. Ask them to show you 35 and 27 with the blocks.
  • Watch the Video (7 mins)
    Play the Khan Academy video "Addition with regrouping | Addition and subtraction within 100 | Early Math | Khan Academy." Instruct students to pay close attention to how the presenter uses blocks to represent the numbers and how they regroup.
  • Guided Practice (10 mins)
    Work through a similar addition problem (e.g., 28 + 14) on the board, using base-ten blocks or drawings to illustrate each step. Emphasize the process of regrouping when the sum of the ones is greater than 9. Have students explain each step as you go.
  • Independent Practice (10 mins)
    Provide students with worksheets or manipulatives to practice addition with regrouping on their own. Circulate to provide support and answer questions. Examples: 19 + 23, 36 + 15, 47 + 24.
  • Wrap Up (3 mins)
    Review the main concepts of the lesson. Ask students to explain in their own words what regrouping means and why it is necessary. Briefly introduce the concept of carrying the one.

Interactive Exercises

  • Block Building Addition
    Students use base-ten blocks to represent two-digit numbers and physically combine the blocks to add them. They must regroup if they have more than 9 ones. Have them write down the numbers and the solution.
  • Drawing Regrouping
    Students draw tens and ones to represent addition problems. They circle groups of ten ones to show regrouping and then write the answer.

Discussion Questions

  • What happens when we add the ones and get a number bigger than 9?
  • Why do we need to regroup?
  • Can you think of a time when you've had to regroup in real life (e.g., counting coins)?

Skills Developed

  • Addition with regrouping
  • Place value understanding
  • Problem-solving

Multiple Choice Questions

Question 1:

What is the value of the '3' in the number 32?

Correct Answer: 3 tens

Question 2:

What is 5 + 7?

Correct Answer: 12

Question 3:

When we have 10 ones, what can we do?

Correct Answer: Make a ten

Question 4:

Which number is in the ones place in 45?

Correct Answer: 5

Question 5:

What does 'regrouping' mean in addition?

Correct Answer: Making a new group of ten

Question 6:

What is 20 + 10?

Correct Answer: 30

Question 7:

If you have 1 ten and 3 ones, what number do you have?

Correct Answer: 13

Question 8:

Which of these shows 35?

Correct Answer: 3 tens and 5 ones

Question 9:

What number comes next: 10, 20, ____

Correct Answer: 30

Question 10:

What is 4 + 6?

Correct Answer: 10

Fill in the Blank Questions

Question 1:

In the number 28, the 2 is in the _____ place.

Correct Answer: tens

Question 2:

When we add 16 + 5, we can make a new group of _____.

Correct Answer: ten

Question 3:

The number 43 has 4 _____ and 3 ones.

Correct Answer: tens

Question 4:

If I have 12 ones, I can regroup to make 1 _____ and 2 ones.

Correct Answer: ten

Question 5:

Adding means putting numbers _______.

Correct Answer: together

Question 6:

1 ten is the same as _______ ones.

Correct Answer: 10

Question 7:

The number 60 has 6 _______.

Correct Answer: tens

Question 8:

When adding 27+15, first add 7 and 5, which equals _______.

Correct Answer: 12

Question 9:

If I have two groups of ten and five ones I have _______

Correct Answer: 25

Question 10:

The number in the ones place of 79 is _______

Correct Answer: 9

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.

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