Approximation and Errors

What is 78.5 rounded to one significant figure?

The weight of a bag of potatoes is 25 kg, correct to the nearest kg.

What is smallest possible weight of the bag of potatoes?

A rectangular plot of land has sides with lengths of 38 m and 52 m correct to the nearest m.

Calculate the maximum possible values of the perimeter of the rectangle.

Hannah measures with a ruler that has marks every 0.1 cm. She says that the lengths of the side of a rectangle are 8.5 cm and 12 cm correct to 1 decimal place.

Calculate the minimum possible values of the perimeter of the rectangle.

The attendance for the basketball game was estimated to be 15,000 people but 12,500 people attended. What was the percent error?

The students measured length during a science experiment, they got 12 cm. But the actual measurement was 14.25 cm. What was the percent error?