Grade 9 Pre-IB Unit 1 CP 27-29

1.
3 486 389 000 000 ≈ 3.49 x 1012

532 471 000 ≈ 5.32 x 108

45 820 173 200 ≈ 4.58 x 1010

8 247 841 ≈ 8.25 x 106

47.286 ≈ 4.73 x 10

258.824 ≈ 2.59 x 102

200 000 000 000 000 ≈ 2 x 1014

2.
a) ( 4.50 x 1010 x 3.48 x 106 ) / ( 6.30 x 107 x 2.79 x 106 )

≈ 8.91 x 102

b) ( 1.98 x 1020 ) / ( 2.77 x 1024 )

≈ 7.16 x 10-5

c) ( 1.13 x 1041 ) / ( 7.15 x 1029 )

≈ 1.58 x 108

1.
2.76 x 10-1 lb of copper is contained in the bodies of 1200 such people.

2.
Light travels 1.8 x 1010m in 6.0 x 101seconds.

* Note that the time amount can also be written as one minute or 6 x 10 seconds instead of 6.0 x 101 seconds.

3.
This computer can perform 2.8 x 1010.

4.
The Arctic Ocean is 5.4 x 106 square miles.

5.
Light from the sun takes 5 x 102seconds to reach the Earth.

6.
There are 5 ×1012 red blood cells in a litre of human blood.

7.
The volume of Lake Erie is 4.88×102 km3