Decimal place value (age 9+)

Question 1

What is the correct way to round the number 3.47 to the nearest whole number and to one decimal place?

Accepted Answer

3 and 3.5

Answer

4 and 3.5

Answer

3 and 3.4

Answer

4 and 3.4

Question 2

Javier recorded the temperature of the water as 12.95 °C. He needs to write the temperature rounded to the nearest tenth of a degree. Which answer below is correct, and why?

Accepted Answer

13.0 – because the hundredths digit is 5, so the tenths digit is increased by 1.

Answer

12.9 – because the hundredths digit is 5, so the tenths digit stays the same.

Answer

13.0 – because we first round to the nearest whole degree (13) and then add .0.

Answer

12.9 – because we only look at the first decimal place and ignore the second.

Question 3

What is 12.95 rounded to one decimal place?

Accepted Answer

13.0

Answer

12.9

Answer

12.95

Answer

13.1

Try three questions

What is the correct way to round the number 3.47 to the nearest whole number and to one decimal place?

Javier recorded the temperature of the water as 12.95 °C. He needs to write the temperature rounded to the nearest tenth of a degree. Which answer below is correct, and why?

What is 12.95 rounded to one decimal place?

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