[2](a)Calculate (3.2 × 10⁵) × (4 × 10⁻²), giving your answer in standard form.

[2](a)Calculate (6.4 × 10⁸) ÷ (1.6 × 10³), giving your answer in standard form.

[3](a)The population of a country is 4.7 × 10⁷ and the population of a city within it is 9.4 × 10⁵. Calculate how many times greater the country's population is than the city's.

[2](a)Calculate (2.5 × 10⁻³) × (4 × 10⁶), giving your answer in standard form.

[2](a)Calculate (9 × 10⁷) ÷ (3 × 10⁻²), giving your answer in standard form.

[2](a)Calculate (5.6 × 10⁴) + (3.2 × 10³), giving your answer in standard form.

[1](a)Write 0.000042 in standard form.

[1](a)Write 3.6 × 10⁵ as an ordinary number.

[2](a)A virus has a diameter of 3 × 10⁻⁸ m. A bacterium has a diameter of 2 × 10⁻⁶ m. Calculate how many times larger the bacterium's diameter is.

[2](a)Calculate (6 × 10³)², giving your answer in standard form.