(a) By first rounding each value to one significant figure, estimate the value of:
33.94 × 0.00772 1 3 1.76

(b) It is given that 53=1.7, 503=3.7, and 5003=7.9. Find the value of 0.0053.

By rounding each number to one significant figure, estimate:
2.45+2.1×4.61.71

By rounding each number to one significant figure, estimate the value of:
410×6.780.23

(a) The number of people at a football match is 27359. Write the number to one significant figure.

(b) The number of people who sat in stand A is 2500 correct to two significant figures. Find the largest number of people that could have sat in stand A.

The side of a square is given as 9 m, correct to the nearest centimetre. Find the least possible value of the side.

(a) Express the ratio 400 cm to 1 km in its simplest form.

(b) Write the numbers in order of size, starting with the smallest:
12, 0.22, 0.25, 0.04

Arrange the following in order of size, starting with the smallest.
512     0.25     16     23

Arrange the following numbers in order starting with the smallest:
1.33, 1.32, 43, 130%

Arrange the number in order of size, starting with the smallest:
47, 23, 0.67, 0.667

The population of Lesotho is approximately 1 870 000.
(a) Write 1 870 000 to the nearest million.

(b) Write 1 870 000 in standard form.

The length of a field is 80 m measured correct to the nearest metre. Find the maximum possible length of the field.

The distance, d, from home to school is 850 metres correct to the nearest 10 m. Find the upper and the lower bound of the distance.

Write 298 correct to 2 significant figures.

The population, P, of a small island was 6380, correct to the nearest 10.
Complete the statements about the limits of P.