Adding Two-Digit Numbers with Coins!

Math Grades 1st Grade 6:28 Video
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Lesson Description

Learn how to add two-digit numbers using American coins as a fun way to understand regrouping!

Video Resource

Grade 1: Math Lesson #86 Adding Two-Digit Numbers With Regrouping (American Coins)

The Eagle's Nest - Our Online Classroom

Duration: 6:28
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Key Concepts

  • Place Value (Tens and Ones)
  • Regrouping (Making a Ten)
  • Adding Two-Digit Numbers

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 manipulatives (coins or drawings).
  • Students will be able to explain the process of regrouping in their own words.

Educator Instructions

  • Introduction (5 mins)
    Begin by reviewing place value (tens and ones). Ask students what each digit in a number like 23 represents (2 tens and 3 ones). Briefly discuss the value of a penny (1 cent) and a dime (10 cents) as a visual aid. Introduce the concept of regrouping as 'making a ten'.
  • Watch the Video (10 mins)
    Watch the video 'Grade 1: Math Lesson #86 Adding Two-Digit Numbers With Regrouping (American Coins)'. Pause at key points to ask questions and ensure understanding.
  • Guided Practice (15 mins)
    Work through several example problems together on the board, using coins (real or drawn) to represent the numbers. For example: 17 + 8. First, represent 17 with 1 dime and 7 pennies. Represent 8 with 8 pennies. Then, ask: 'Can we make a ten?' Group 3 pennies from the 8 with the 7 pennies to make a ten (dime). Replace the 10 pennies with one dime. Now we have 2 dimes and 5 pennies, which is 25.
  • Independent Practice (15 mins)
    Provide students with worksheets or manipulatives (coins) to practice adding two-digit numbers with regrouping on their own. Circulate to provide support as needed.
  • Wrap-up (5 mins)
    Review the key concepts of place value and regrouping. Ask students to share what they learned during the lesson.

Interactive Exercises

  • Coin Addition Game
    Divide students into pairs. Give each pair a set of coins (pennies and dimes). One student says an addition problem (e.g., 15 + 7). The other student uses the coins to solve the problem, explaining their regrouping process.
  • Regrouping Race
    Divide the class into two teams. Write an addition problem with regrouping on the board. The first student from each team to correctly solve the problem on the board wins a point for their team.

Discussion Questions

  • What is place value, and why is it important?
  • When do we need to regroup when adding numbers?
  • Can you give an example of when you would use regrouping in real life?

Skills Developed

  • Addition
  • Problem-Solving
  • Place Value Understanding
  • Critical Thinking

Multiple Choice Questions

Question 1:

What does the 2 in the number 25 mean?

Correct Answer: 2 tens

Question 2:

What is 10 ones equal to?

Correct Answer: 1 ten

Question 3:

If you have 1 dime, how many pennies do you have?

Correct Answer: 10 pennies

Question 4:

What do we do when we have more than 9 ones in the ones place?

Correct Answer: Regroup them

Question 5:

What is 12 + 8?

Correct Answer: 20

Question 6:

What is 15 + 5?

Correct Answer: 20

Question 7:

If you have 13 pennies and your friend gives you 7 more pennies, how many pennies do you have in all?

Correct Answer: 20

Question 8:

Which place is on the right?

Correct Answer: Ones

Question 9:

What is 16 + 4?

Correct Answer: 20

Question 10:

If you have 24 pennies and want to make a group of tens, how many pennies do you have left over?

Correct Answer: 4

Fill in the Blank Questions

Question 1:

The number 32 has 3 ________ and 2 ones.

Correct Answer: tens

Question 2:

We ________ when we have more than 9 ones.

Correct Answer: regroup

Question 3:

10 ones is the same as 1 ________.

Correct Answer: ten

Question 4:

A dime is worth ________ pennies.

Correct Answer: 10

Question 5:

When adding 17 + 3, we need to ________ to make a 20.

Correct Answer: regroup

Question 6:

The ________ place is on the left side.

Correct Answer: tens

Question 7:

5 + 5 = ________

Correct Answer: 10

Question 8:

A penny is worth ________ cent.

Correct Answer: 1

Question 9:

In the number 46, 6 is in the ________ place.

Correct Answer: ones

Question 10:

When we regroup ones into tens, we ________ a group of ten.

Correct Answer: make

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. 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. CCSS.Math.Content.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:

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