 # Rounding with decimals

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1. Word cloud
120 seconds
What is the simplest way to round a decimal number?
2. Slide
60 seconds
Rounding means finding the closest whole number to a decimal number. Look at the number to the right of the decimal point. If it's less than 5, round down. If it's 5 or more, round up. Example: 4.67 rounded is 4.7 because the number after the decimal point is 7.
Rounding with Decimals
3. Slide
60 seconds
Rounding: The process of finding an approximate value by replacing a number with an easier to work with but close number. Decimal: A number written in decimal form is a number with a decimal point and at least one digit to the right of the decimal point. Significant Figures: The number of digits that are meaningful in a number, including the digits to the right of the decimal point.
Concepts:
4. Slide
60 seconds
In the usual decimal system, the number 0.5 is equal to 1/2. This means that if you divide 1 by 2, the result is the same as 0.5. The symbol used to represent decimals is known as the decimal point. It is used to separate the whole number from the decimal part of a number. The number 0.25 can be expressed as a fraction. It is equal to 1/4 or 25/100.
Did you know?
5. Open question
300 seconds
What does it mean to round a decimal to the nearest whole number?
6. Open question
300 seconds
7. Open question
300 seconds
What difficulties did you have when rounding decimals?
8. Open question
300 seconds
What strategies did you find helpful in rounding decimals?
9. Drawings
450 seconds
Brain break: Draw a silly combination of a flying dinosaur and a monkey swinging from tree vines, with a big grin on its face
10. Drawings
1260 seconds
Question: Round the number 3.472 to the nearest tenth. Clues: • Remember decimals are numbers after the decimal point. • The tenths place is the first digit after the decimal point. • Round up if the digit after the tenths place is 5 or greater. In pairs: Select and solve one of the tasks: A. Working in pairs, draw a number line to show how you rounded 3.472 to the nearest tenth. B. Explain how you rounded 3.472 to the nearest tenth to your partner.
11. Poll
60 seconds
What is 4.7 rounded to the nearest whole number?
• 4
• 6
• 3
• 5
12. Poll
60 seconds
Round 3.2 to the nearest whole number.
• 3
• 2
• 4
• 1
13. Poll
60 seconds
What is 6.8 rounded to one decimal place?
• 6.9
• 7.0
• 6.8
• 6.7
14. Slide
60 seconds
To round a decimal, look at the number in the tenths place. If it’s 5 or more, add 1 to the number in the ones place. If it’s less than 5, leave the number in the ones place unchanged. If the number is at the end of the decimal, look at the number before it to determine whether to round up or down. To round to the nearest whole number, look at the number in the hundredths place. If it’s 5 or more, add 1 to the number in the tenths place. If it’s less than 5, leave the number in the tens place unchanged.
Rounding with Decimals
15. Slide
60 seconds
The first decimal system was invented by the ancient Egyptians around 4000 BC. The number pi is an irrational number and can be written as a never-ending decimal. The number 0.999... (repeating) is equal to 1, and is sometimes referred to as 'the wall between 0 and 1'.
Did you know?
16. Slide
60 seconds
The first decimal system was invented by the ancient Egyptians around 4000 BC. The number pi is an irrational number and can be written as a never-ending decimal. The number 0.999... (repeating) is equal to 1, and is sometimes referred to as 'the wall between 0 and 1'.
Did you know?
17. Word cloud
120 seconds
How do you round a decimal with one decimal place?
18. Poll
60 seconds
Round 14.56 to the nearest whole number.
• 15
• 16
• 14
• 13
19. Open question
180 seconds
Work together in pairs: What is the result when you round 9.67 to the nearest tenth?