Number worksheet — GCSE Foundation

1.Postage on a parcel is calculated as £4.60, correct to the nearest 20p. Which of these could not be the actual cost of the postage?

2.Work out 2/5 of 45.

3.A rectangular field measures 19.6 m by 48.3 m. Work out an estimate for the area of the field, by rounding each length to 1 significant figure.

4.A car manufacturer offers a car in 6 colours and 4 trim levels. Two colour-and-trim combinations are not available: red with sport trim, and white with sport trim. Work out how many different colour-and-trim combinations are available.

5.Work out an estimate for 2.9² + 3.1², by rounding each number to the nearest whole number.

6.A coach journey has a 55 minute first leg, a 20 minute break and a 40 minute second leg. The coach leaves at 13:25. Work out the arrival time, using the 24-hour clock.

7.3/5 of the students in a year group walk to school. 90 students walk to school. Work out the total number of students in the year group.

8.Write the fraction 3/4 as a decimal.

9.Write down the value of 3⁰

10.A circle has a radius of 5 cm. Work out the exact circumference of the circle, in terms of π.

11.Work out an estimate for 312 × 19, by rounding each number to 1 significant figure.

12.Work out (4 × 10⁻³) × (2 × 10⁵). Give your answer in standard form.

13.In a photo album the ratio of colour photos to black-and-white photos is 9 : 4. Work out the number of black-and-white photos as a fraction of the number of colour photos.

14.Put these numbers in order, starting with the smallest: 3.2 × 10⁴, 2.9 × 10⁵, 4.1 × 10³

15.A number, y, is equal to 8.2 when rounded to 1 decimal place. Write down the error interval for y.