Powers, Roots & Standard Form (Edexcel IGCSE Maths): Exam Questions

The table shows the population, correct to two significant figures, of each of six countries in April 2016.

Write 9.3×10⁷ as an ordinary number.

Which of these countries had the least population?

The population of China was 1.382×10⁹ in April 2016. The population of India was 1.327×10⁹ in April 2016.

Work out the difference between the population of China and the population of India in April 2016. Give your answer in standard form.

Write 76 000 000 in standard form.

Write 5.4 × 10^–4 as an ordinary number.

Find the square root of 441

Write$5.87\times10^{-4}$ as an ordinary number.

Write 84 000 000 in standard form.

The number of neurons in a human brain is $8.5\times10^{10}$ The number of neurons in a monkey brain is $1.47\times10^{9}$

The number of neurons in a human brain is $K\times$ the number of neurons in a monkey brain.

Work out the value of $K$ Give your answer correct to one decimal place.

Write $4.5\times10^{-3}$ as an ordinary number.

Write 342890 in standard form.

The population of Hungary is $9.6\times10^{7}$. The population of Indonesia is $2.43\times10^{8}$

Calculate the difference between the population of Hungary and Indonesia. Give your answer in standard form.