Adding Fun with Regrouping!

Math Grades 1st Grade 4:13 Video
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Lesson Description

Learn how to add a one-digit number to a two-digit number by regrouping ones into tens, just like Sal from Khan Academy!

Video Resource

Regrouping to add 1-digit number | Addition and subtraction | 1st grade | Khan Academy

Khan Academy

Duration: 4:13
Watch on YouTube

Key Concepts

  • Place Value (Tens and Ones)
  • Regrouping (Making a ten from ones)
  • 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 a one-digit number to a two-digit number with regrouping.
  • Students will be able to explain the process of regrouping using manipulatives or drawings.

Educator Instructions

  • Introduction (5 mins)
    Begin by reviewing place value. Ask students what the numbers in 23 mean (2 tens and 3 ones). Use base-ten blocks to visually represent this. Ask them if they remember what happens when you have more than 9 ones.
  • Video Viewing (7 mins)
    Watch the Khan Academy video 'Regrouping to add 1-digit number'. Pause at key points (e.g., when Sal introduces the problem and when he regroups) to ask clarifying questions.
  • Guided Practice (10 mins)
    Work through several addition problems as a class (e.g., 18 + 5, 26 + 7). Use base-ten blocks or drawings to model the regrouping process. Emphasize the language of 'making a ten'.
  • Independent Practice (10 mins)
    Students complete addition problems with regrouping on their own, using provided worksheets or manipulatives. Circulate to provide support and answer questions.
  • Wrap-up (3 mins)
    Review the key concept of regrouping. Ask students to explain in their own words why we need to regroup when adding.

Interactive Exercises

  • Base-Ten Block Addition
    Provide students with base-ten blocks. Give them addition problems that require regrouping. Have them physically manipulate the blocks to model the process of making a ten and regrouping it to the tens place.
  • Drawing Regrouping
    Have students draw tens and ones to represent addition problems with regrouping. They should circle groups of ten ones and show how they become a ten in the tens column.

Discussion Questions

  • What does it mean to regroup?
  • Why do we regroup when adding ones and getting more than 9?
  • Can you think of a time when you've used regrouping outside of math class (e.g., trading ten pennies for a dime)?

Skills Developed

  • Addition with Regrouping
  • Place Value Understanding
  • Problem-Solving

Multiple Choice Questions

Question 1:

What is 10 ones called?

Correct Answer: A Ten

Question 2:

What does it mean to regroup?

Correct Answer: To make a ten

Question 3:

What is the tens place in the number 42?

Correct Answer: 4

Question 4:

What is the ones place in the number 79?

Correct Answer: 9

Question 5:

When we add 8 + 5, we make a new ten. How many ones are left over?

Correct Answer: 3

Question 6:

Which of these numbers has 3 tens?

Correct Answer: 35

Question 7:

What is 25 + 6?

Correct Answer: 31

Question 8:

What is the next number after 9?

Correct Answer: 10

Question 9:

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

Correct Answer: 13

Question 10:

Which number shows how many groups of ten are in the number 67?

Correct Answer: 6

Fill in the Blank Questions

Question 1:

When we add and get more than 9 ones, we need to ________.

Correct Answer: regroup

Question 2:

The number 10 is made of ____ ones.

Correct Answer: 10

Question 3:

In the number 56, the 5 is in the _______ place.

Correct Answer: tens

Question 4:

In the number 32, the 2 is in the _______ place.

Correct Answer: ones

Question 5:

When we regroup, we make a new ______.

Correct Answer: ten

Question 6:

34 + 7 = _____.

Correct Answer: 41

Question 7:

A ten looks like a long ______ in base ten blocks.

Correct Answer: line

Question 8:

A one looks like a small ______ in base ten blocks.

Correct Answer: square

Question 9:

When adding 28 + 4, we get _____ ones in all

Correct Answer: 12

Question 10:

If you have 4 tens and 0 ones, you have the number _____.

Correct Answer: 40

Educational Standards

1.NBT.C.4:Add within 100, including adding a two-digit number and a one-digit number, 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: CCSS.Math.Content.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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