A man is 1.7 m long. A paramecium is 85 µm long. How does the length of the man compare to the length of the paramecium
1 meter ==1,000,000 micrometers.
1.7 x 1,000,000==1,700,000 micrometers.
1,700,000 / 85 ==20,000 times bigger for a ratio of:
20,000 : 1
The man is twenty thousand(2 *104) times larger than the paramecium