remember the associative and commutative properties of multiplcation
ab=ba and (ab)c=a(bc)
also, the exponential rules
[tex](x^m)(x^n)=x^{m+n}[/tex]
also, scientific notation is [tex]a*10^m[/tex] where 1≤x<10 and m is an integer
therefor
[tex](2.3*10^4) \space\ times \space\ (4.2*10^6)=[/tex]
[tex](2.3)(10^4)(4.2)(10^6)=[/tex]
[tex](2.3)(4.2)(10^4)(10^6)=[/tex]
[tex](9.66)(10^{4+6})=[/tex]
[tex]9.66*10^{10}[/tex]
