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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. _________