Answer:
[tex]a) \: 421 {mm}^{2} \: = 0.000421 {m}^{2} [/tex]
[tex]b) \: 9.3 {kg}^{2} \: = 9,300,000 {g}^{2} [/tex]
[tex]c) \: 25 {kl}^{2} \: = \: 25,000,000 {g}^{2} [/tex]
[tex]d) \: 1439 {m}^{2} = 0.001439 {k m}^{2} [/tex]
