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Standard Form 2

This stuff gets a lot easier if you know how to handle your calculator — read and learn. Standard index Form with a Calculator Use the EXP button (or EE button) to enter numbers in standard index form. E.g. 1.7 × 109 + 2.6 × 1010 The answer is 2.77 × 1010

Q7)

If x = 4 × 105 and y = 6 × 104 work out the value of:
  1. xy _________
  2. 4x _________
  3. 3y _________

Q8)

  1. Which is greater, 4.62 × 1012 or 1.04 × 1013, and by how much? _________

Q9)

  1. Which is smaller 3.2 × 10^-8 or 1.3 × 10-9 and by how much? _________

Q10)

The following numbers are not written in standard index form. Rewrite them correctly using standard index form.
  1. 42 × 106 _________
  2. 38 × 10-5 _________
  3. 10 × 106 _________
  4. 11.2 × 10-5 _________
  5. 843 × 103 _________
  6. 42.32 × 10-4 _________
  7. 17 × 1017 _________
  8. 28.3 × 10-5 _________
  9. 10 × 10-3 _________

Q11)

  1. What is 7 million in standard index form? _________

Q12)

The radius of the Earth is 6.38 × 103 km.
  1. What is the radius of the Earth in measured in cm? Leave your answer in standard form. _________

Q13)

One atomic mass unit is equivalent to 1.661 × 10-27 kg.
  1. What are two atomic mass units equivalent to (in standard index form)? _________

Q14)

The length of a light year, the distance light can travel in one year, is 9.461 × 1015 m. How far can light travel in: (Write your answers in standard form)
  1. 2 years? _________
  2. 6 months? _________

Q15)

  1. The surface area of the Earth is approximately 5.1 × 108 km2. Write this without using standard form. _________
  2. The area of the Earth covered by sea is 362 000 000 km2. Write this in standard form. _________
  3. What is the approximate area of the Earth covered by land? Write your answer without using standard form. _________

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