Rounding Decimals
Part 1
Part 1
What are the rules of rounding?
5 or more raise the score, 4 or less let it rest.
Round 43.83 to the nearest tenth.
43.8
Round 2.63 to the nearest whole number.
3
Student A says:
4.62 rounded to the nearest whole number is 5.
Are they correct? Why or why not?
✅ Correct
Why: The tenths digit is 6, which is greater than 5, so the number rounds up.
To which place value is the number rounded?
5.855 to 6
Ones
Round 5.47 to the nearest tenth.
5.5
Student A says:
8.43 rounded to the nearest whole number is 9.
Are they correct? Why or why not?
❌ Incorrect
Why: The tenths digit is 4, which is less than 5, so the number rounds down to 8.
8.293
What is the place value of 9?
Hundredths
Round 8.426 to the nearest hundredth.
8.43
Student A says:
3.46 rounded to the nearest tenth is 3.4.
Are they correct? Why or why not?
❌ Incorrect
Why: The hundredths digit is 6, so the tenths digit rounds up.
Correct Answer: 3.5
Round 9.845 to the name place value.
"Tenths"
9.8
After rounding 24.89, the answer is 25. What place value was 24.89 rounded to.
Ones/whole number
Round 9.845 to the nearest tenth.
9.8
Student A says:
7.583 rounded to the nearest hundredth is 7.59.
Are they correct? Why or why not?
❌ Incorrect
Why: The thousandths digit is 3, which is less than 5.
Correct Answer: 7.58
Round each number to the nearest tenth.
15.53, 17.755, 18.55
15.5, 17.8, 18.6
Round 7.595 to the nearest hundredth.
7.60
Student A says:
5.495 rounded to the nearest whole number is 6 because there is a 9 in the hundredths place.
Are they correct? Why or why not?
❌ Incorrect
Why: Only the tenths digit matters when rounding to the nearest whole number.
The tenths digit is 4.
Correct Answer: 5