ESTIMATION AND ROUNDING

9.478 m rounded to 3 s.f

• 9

• 9.47

• 9.48

• 9.478

• 9.5

6.999 rounded to 2 d.p

• 6.99

• 7.00

• 6.90

• 6.00

The measure 0.001020 mg has ________ s.f

• 6

• 2

• 3

• 4

• 5

Rounding to the nearest hundredth is like rounding to

• 2 dp

• 1 dp

• 3 dp

• 2 s.f

• 3 s.f

1002.50 USD to the nearest hundred USD

• 1100 USD

• 1002 USD

• 1000 USD

• 1003 USD

A circle has radius 33 cm. Calculate the circumference of the circle. Write down your answer correct to 3 sf.

• 207 cm

• 207.345 cm

• 3420 cm²

• 3400 cm²

• 207.3 cm

The range of possible values for 3.2 m, which is rounded to the nearest tenth of m is

• 2.7 m and 3.7 m

• 2.8 and 3.4 m

• 3.15 m and 3.25 m

• 3 m and 3.5 m

With 72 million bicycles, correct to the nearest million, Japan is at the top of the list of countries with most bicycles per person. On average, Japanese people travel about 2 km by bicycle, correct to the nearest km, each day. The upper bound for the total distance travelled is

Hint: find upper bound for bicycles and people

• 140 million km

• 181.25 million km

• 107.25 million km

• 160 million km

• 170.45 million km

In 1856, Andrew Waugh announced Mount Everest to be 8840 m high, after several years of calculations based on observations made by the Great Trigonometric Survey. More recent surveys confirm the height as 8848 m. The percentage error is

• 9.04%

• 0.904%

• 0.094%

• 0.0904%

• 0.0009%

Eratosthenes estimated the circumference of the Earth as 250 000 stadia (the length of an athletic stadium). If we assume he used the most common length of stadia of his time, his estimate of the circumference of the Earth would be 46 620 km. Currently, the accepted average circumference of the Earth is 40030.2 km. The percentage error of Eratosthenes' estimate of the circumference of the Earth is

• 16.5%

• 17%

• 0.16%

• 22.4%