Nada’s shower uses 7.8 litres of water per minute.
By rounding the number of litres to the nearest whole number, estimate how many litres she will use if her shower lasts 9 minutes.
Calculate exactly how many liters of water a 12-minute shower will consume.
The average person blinks about 900 times an hour.
By rounding the number of hours in a day to the nearest ten, estimate how many times a person blinks in a day.
Is this estimate more or less than the actual number of times a person blinks in a day?