Numbers of Any Magnitude, SMB-015 The width of red blood cell is 8 nanometres or `8 xx 10^{-9}` metres. How many red blood cells, lined up side by side in straight line, would it take to form a 1 cm distance. (2 marks) Show Answers Only `1.25 xx 10^6` Show Worked Solution `text{Convert cm to metres:}` `text{100 cm = 1 m}\ => \ text{1 cm = 0.01 m}` `text{Number of cells}` `=0.01/(8xx10^{-9})` `=1\ 250\ 000` `=1.25 xx 10^6`