# Introduction to decimals

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1. Word cloud
120 seconds
What is a decimal?
2. Slide
60 seconds
Decimals are numbers with one or more digits after the decimal point, such as 3.25. Decimals can represent fractions, like 0.75 which equals 3/4. To compare decimals, look at the numbers to the right of the decimal point.
Introducing Decimals
3. Slide
60 seconds
Place Value: The position of a digit in a number determines its value. For example, in the number 456.8, the 8 is in the tenths place, so it is worth 0.8. Rounding: The process of replacing a number with an approximate value that is easier to use. For example, the number 5.876 can be rounded to 5.9. Equivalent Forms: The same value expressed in different forms. For example, 0.75 can be written as the fraction 3/4 or the decimal 75/100.
Concepts:
4. Open question
300 seconds
What are some real world examples of decimals?
5. Open question
300 seconds
How can decimals be used to represent fractions?
6. Open question
300 seconds
7. Open question
300 seconds
8. Drawings
450 seconds
Brain break: Draw a goofy penguin balancing an ice cream cone on its head
9. Poll
60 seconds
Which of the following is a decimal number?
• 2+3i
• 0.5
• 5/6
10. Poll
60 seconds
What does the decimal point represent in a decimal number?
• Separates the whole number from its fractional part
• Indicates multiplication
11. Poll
60 seconds
How would you read the decimal number 0.75?
• Seven fifths
• Seven and five tenths
• Seventy-five hundredths
12. Poll
60 seconds
What is the place value of 4 in the decimal number 3.426?
• Hundredths
• Thousandths
• Tenths
13. Poll
60 seconds
Which fraction is equivalent to the decimal number 0.2?
• (1/2)²
• 1/5
• 1/10
14. Open question
180 seconds
Work together in pairs: Q: How can you use decimal notation to represent fractions?