Decimal to Percent Dive!

Mathematics Grades 4th Grade 1:50 Video
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Lesson Description

Learn to easily convert decimals to percents and back again with a fun song and activities!

Video Resource

Percentages Song | Converting Decimals to Percents

Math Songs by NUMBEROCK

Duration: 1:50
Watch on YouTube

Key Concepts

  • Decimals as fractions with a denominator of a power of ten.
  • Percents as portions out of one hundred.
  • Converting decimals to percents by moving the decimal point two places to the right and adding a percent sign.
  • Converting percents to decimals by moving the decimal point two places to the left and removing the percent sign.

Learning Objectives

  • Students will be able to convert decimals to percents.
  • Students will be able to convert percents to decimals.

Educator Instructions

  • Introduction (5 mins)
    Begin by asking students what they know about decimals and percents. Discuss real-world examples where they might encounter these concepts (e.g., sales, discounts, grades).
  • Watch the Video (3 mins)
    Play the "Percentages Song | Converting Decimals to Percents" video from NUMBEROCK. Encourage students to listen carefully to the lyrics explaining the conversion process.
  • Discuss the Video (5 mins)
    After the video, ask students to summarize the main points. What is the trick to converting decimals to percents? What about converting percents to decimals?
  • Practice Conversions (15 mins)
    Provide students with a worksheet containing a mix of decimals and percents. Have them convert each number to the other form. Start with simple examples (e.g., 0.5, 25%) and gradually increase the difficulty. Work through a few examples as a class first.
  • Real-World Application (10 mins)
    Present word problems that involve converting decimals to percents and vice versa in real-world scenarios, such as calculating sales tax or discounts. For example: 'A store is having a 20% off sale. What is that as a decimal?' or 'A shirt costs $10 and sales tax is $0.07 per dollar. What is the sales tax as a percentage?'
  • Assessment (7 mins)
    Administer the multiple choice quiz and the fill in the blank quiz to assess student understanding of the material.

Interactive Exercises

  • Number Line Activity
    Create a number line from 0 to 1. Label 0, 0.25, 0.5, 0.75, and 1 as decimals. Then, have students write the corresponding percents (0%, 25%, 50%, 75%, 100%) above the decimals. This helps visualize the relationship between the two.
  • Percent Square Game
    Use a 10x10 grid (representing 100%). Shade in a certain number of squares and have students write the corresponding decimal and percent. For example, if 35 squares are shaded, the answer is 0.35 and 35%.

Discussion Questions

  • Why is it important to understand how to convert between decimals and percents?
  • Can you think of a time when you have used or seen decimals and percents used in real life?
  • What happens if you forget to move the decimal point when converting?

Skills Developed

  • Decimal and Percent Conversion
  • Problem-Solving
  • Critical Thinking
  • Active Listening

Multiple Choice Questions

Question 1:

To change a decimal to a percent, you move the decimal point how many places to the right?

Correct Answer: Two

Question 2:

What is 0.75 as a percent?

Correct Answer: 75%

Question 3:

To change a percent to a decimal, you move the decimal point how many places to the left?

Correct Answer: Two

Question 4:

What is 50% as a decimal?

Correct Answer: 0.50

Question 5:

What is 0.2 as a percent?

Correct Answer: 20%

Question 6:

What is 100% as a decimal?

Correct Answer: 1.0

Question 7:

A store offers a 25% discount. What is this as a decimal?

Correct Answer: 0.25

Question 8:

The decimal 0.01 is equal to what percent?

Correct Answer: 1%

Question 9:

Which of these is the same as one half?

Correct Answer: 0.5 and 50%

Question 10:

If a test score is 0.9, what percent did the student get correct?

Correct Answer: 90%

Fill in the Blank Questions

Question 1:

A percent is a portion out of one ________.

Correct Answer: hundred

Question 2:

To turn a decimal into a percent, move the decimal point two places to the ________.

Correct Answer: right

Question 3:

0.60 is the same as ________ percent.

Correct Answer: 60

Question 4:

1% is the same as the decimal ________.

Correct Answer: 0.01

Question 5:

To turn a percent into a decimal, move the decimal point two places to the ________.

Correct Answer: left

Question 6:

0.25 is the same as ________ percent.

Correct Answer: 25

Question 7:

75% is the same as the decimal ________.

Correct Answer: 0.75

Question 8:

The decimal 0.99 is the same as ________ percent.

Correct Answer: 99

Question 9:

50% is the same as the fraction one ________.

Correct Answer: half

Question 10:

The amount of squares in a percent square is ________.

Correct Answer: 100

Educational Standards

4.N.3:Represent and compare fractions and decimals in real-world and mathematical situations; use place value to understand decimal quantities. 4.N.3.6:Represent tenths and hundredths with concrete and pictorial models, making connections between fractions and decimals. 4.N.3.7:Read and write decimals in standard, word, and expanded form up to at least the hundredths place in a variety of contexts, including money.

Teaching Materials

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