Problem:
The circumference of the earth is about 4 x 104 km while the moon is 1.1 x 104 km. About how many is the difference of their circumference?
A. 5.4 x108 km
B. 5.4 x 104 km
C. 2.9 x10^4 km
D. 2.9 x10 km
Solution:
= 4 x 10^4 km - 1.1 x 10^4 km
= 2.9 x 10^4
Answer:
= 2.9 x 10^4
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