Adding Two-Digit Numbers with Dimes and Pennies

Math Grades 1st Grade 6:29 Video
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Lesson Description

Learn how to add two-digit numbers using dimes and pennies! We'll play store and practice our math skills.

Video Resource

Grade 1: Math Lesson #74 AMERICAN Adding Two-Digit Numbers Using Dimes and Pennies

The Eagle's Nest - Our Online Classroom

Duration: 6:29
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Key Concepts

  • Place Value (Tens and Ones)
  • Adding Two-Digit Numbers
  • Using Coins (Dimes and Pennies) as a Model

Learning Objectives

  • Students will be able to identify the value of dimes and pennies.
  • Students will be able to represent two-digit numbers using dimes and pennies.
  • Students will be able to add two-digit numbers by combining dimes and pennies.
  • Students will be able to apply addition skills in a real-world context (playing store).

Educator Instructions

  • Introduction (5 mins)
    Begin by reviewing the value of dimes and pennies. Ask students: 'What is a dime worth?' (10 cents) 'What is a penny worth?' (1 cent). Explain that today, they will be using dimes and pennies to help them add two-digit numbers.
  • Modeling with Coins (10 mins)
    Demonstrate how to represent a two-digit number using dimes and pennies. For example, the number 23 can be represented by 2 dimes and 3 pennies. Practice with a few examples, having students create the coin representations.
  • Adding with Coins (15 mins)
    Present addition problems, such as 23 + 14. Guide students to represent each number with dimes and pennies. Then, combine the dimes and pennies to find the total. (2 dimes + 1 dime = 3 dimes, 3 pennies + 4 pennies = 7 pennies. Total: 3 dimes and 7 pennies = 37). Work through several examples together.
  • Playing Store (10 mins)
    Set up a 'store' scenario with simple items labeled with prices (e.g., sticker - 15 cents, pencil - 22 cents). Have students 'buy' items and calculate the total cost using dimes and pennies. For example, if a student buys a sticker for 15 cents and a pencil for 22 cents, they will need to add 15 + 22.
  • Wrap-up (5 mins)
    Review the key concepts: Dimes represent tens, pennies represent ones. Adding two-digit numbers involves combining the tens (dimes) and ones (pennies). Ask students to share what they learned.

Interactive Exercises

  • Coin Representation
    Give each student a worksheet with two-digit numbers. Students draw the corresponding number of dimes and pennies for each number.
  • Adding Pairs
    Provide students with pairs of two-digit numbers. They use manipulatives (dimes and pennies or drawings) to add the numbers together and write down the answer.

Discussion Questions

  • Why is it helpful to use dimes and pennies when adding two-digit numbers?
  • How are dimes and pennies related to tens and ones?
  • Can you think of other times when you might need to add two-digit numbers in real life?

Skills Developed

  • Addition
  • Place Value Understanding
  • Problem Solving
  • Real-World Application of Math Skills

Multiple Choice Questions

Question 1:

A dime is worth how many cents?

Correct Answer: 10 cents

Question 2:

A penny is worth how many cents?

Correct Answer: 1 cent

Question 3:

How many dimes are in the number 30?

Correct Answer: 3

Question 4:

How many pennies are in the number 7?

Correct Answer: 7

Question 5:

Which coins make 25 cents?

Correct Answer: 2 dimes, 5 pennies

Question 6:

If you have 1 dime and 3 pennies, how much money do you have?

Correct Answer: 13 cents

Question 7:

What is 2 dimes and 4 pennies plus 1 dime and 2 pennies?

Correct Answer: 3 dimes and 6 pennies

Question 8:

Which is more, 4 dimes or 3 dimes and 8 pennies?

Correct Answer: 4 dimes

Question 9:

Mom gave me 3 dimes. Dad gave me 5 pennies. How much do I have?

Correct Answer: 35 cents

Question 10:

I have 2 dimes and you have 1 dime and 7 pennies. Who has more?

Correct Answer: I do

Fill in the Blank Questions

Question 1:

A _____ is worth 10 cents.

Correct Answer: dime

Question 2:

A _____ is worth 1 cent.

Correct Answer: penny

Question 3:

The number 42 has 4 _____ and 2 ones.

Correct Answer: tens

Question 4:

3 dimes is the same as _____ cents.

Correct Answer: 30

Question 5:

To make 27 cents, you need 2 dimes and _____ pennies.

Correct Answer: 7

Question 6:

1 dime and 5 pennies equals ______ cents.

Correct Answer: 15

Question 7:

4 dimes plus 3 dimes equals ______ dimes.

Correct Answer: 7

Question 8:

The number 59 is made of 5 dimes and ____ pennies.

Correct Answer: 9

Question 9:

If I have 6 dimes, I have ____ cents

Correct Answer: 60

Question 10:

If you buy something for 12 cents, you can use 1 dime and ____ pennies.

Correct Answer: 2

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: 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.

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