$\text{a)}6,3\cdot {10}^5=6,3\cdot 100000=630000$   

$630000<6300000$    

 

$\text{b)}2,8\cdot {10}^7=2,8\cdot 10000000=28000000$   

$28000000>2800000$ $28000000>2800000$  

 

$\text{c)}7,4\cdot {10}^6=7,4\cdot 1000000=7400000$  

$7400000=7400000$  

 

$\text{d)}9,6\cdot {10}^8=9,6\cdot 100000000=960000000$  

$960000000=960000000$        

 

$\text{e)}3\cdot {10}^{-6}=3\cdot 0,000001=0,000003$   

$3\cdot {10}^{-6}>0,0000003$  

 

$\text{f)}4,3\cdot {10}^{-7}=4,3\cdot 0,0000001=0,00000043$

$4,3\cdot {10}^{-7}<0,00000048$    

 

$\text{g)}5,2\cdot {10}^{-8}=5,2\cdot 0,00000001=0,000000052$

$5,2\cdot {10}^{-8}=0,000000052$   

 

$\text{h)}4,1\cdot {10}^{-7}=4,1\cdot 0,0000001=0,00000041$

$4,1\cdot {10}^{-7}<0,0000041$