Standard formIB MYP Maths Extended: Mind map

Exam questions on Standard form

1. The Earth is about $150\,000\,000$ km from the Sun. Light travels at $3\times10^{5}$ km per second.
   Mars is $2.28\times10^{8}$ km from the Sun. Find how many times further from the Sun Mars is than the Earth. Give your answer to 2 significant figures.2 marks
2. A red blood cell has a diameter of about $7\times10^{-6}$ m. A hydrogen atom has a diameter of about $1.06\times10^{-10}$ m.
   A bacterium has a length of $2.5\times10^{-6}$ m. Without a calculator, find the total length of $4000$ of these bacteria placed end to end. Give your answer in standard form, in metres.2 marks
3. A lorry carries $2.5\times10^{3}$ kg of rice. One kilogram of rice contains about $5\times10^{4}$ grains.
   Without a calculator, find the number of grains of rice on the lorry. Give your answer in standard form.3 marks