How many significant figures are there in -0.090 80?

Round off 1 296 717 to 3 significant figures.

Round off 509.96 to 4 significant figures.

How many significant figures does the following number have? 9 000, correct to the nearest ten

The height of a student is measured as 145.8 cm, correct to the nearest 0.2 cm. What is the maximum error?

The height of a student is measured as 145.8 cm. The actual height is 150 cm. What is the absolute error?

John measures his weight as 105 kg, correct to the nearest kg. Which of the following cannot be the actual weight of John?

David estimates the number of balls in a box as 60. If the actual number of balls is 75, find the relative error of David’s estimation.

Which of the following approximate values has exactly 4 significant figures?

The measured length of a ribbon is 68 cm, correct to the nearest cm. Find the percentage error, correct to 3 significant figures.

The weight of a notebook computer is (3.0 ± 0.15) kg. Find the percentage error of this measurement.