Rounding Numbers
3-5
2
Understanding Decimals
Lesson Details
Grade Level
3-5
Duration (minutes)
1
Summary
A Grade 3-5 math lesson explaining decimals as a way to show parts of a whole, covering place value (ones, tenths, hundredths) using $3.25 as an example, and how to compare decimals like 0.7 and 0.4 by comparing digits place by place.
Student Worksheet: Understanding Decimals
Teacher Note: Students can watch the video lesson above and answer the questions. Click the “Teacher Answer Key” dropdown below when you are ready to review the solutions!
Key Concepts:
• Decimals: A decimal shows a part of a whole. The decimal point separates whole numbers from parts of a whole.
• Place Value: Numbers to the left of the decimal point are whole numbers. The first digit to the right is the tenths place, and the second is the hundredths place.
• Reading Decimals: In 3.25, the 3 is three whole dollars, the 2 is in the tenths place, and the 5 is in the hundredths place — together, .25 means 25 cents.
• Comparing Decimals: Compare the whole numbers first, then compare the tenths place, then the hundredths place, until you find a difference.
Instructions: Read each question carefully and write your answer in the space provided.
- Question 1: What does a decimal point separate?
- Question 2: In the number 3.25, what digit is in the ones place? What digit is in the tenths place? What digit is in the hundredths place?
- Question 3: What does 3.25 mean in terms of dollars and cents?
- Question 4: Compare 0.7 and 0.4. Which is greater, and how do you know?
- Question 5: Why do you compare the whole numbers first when comparing two decimals?
Click to reveal Teacher Answer Key
1. The decimal point separates whole numbers from parts of a whole.
2. Ones place: 3. Tenths place: 2. Hundredths place: 5.
3. 3.25 means 3 whole dollars and 25 cents.
4. 0.7 is greater than 0.4, because 7 tenths is more than 4 tenths.
5. Because the whole number tells you the biggest part of the value; if the whole numbers are different, you don’t even need to look at the decimal parts to know which number is bigger.
Disclaimer: This worksheet was generated with AI assistance based on original video content. It is intended for educational reference only. Teachers are encouraged to review and adjust questions to fit their curriculum standards before classroom use.
🎯 Extension Activity: Find three prices at a store or online (like $4.50, $12.75, and $2.30). Identify the digit in the tenths and hundredths place for each price, then put all three prices in order from least to greatest.