The two numbers I wish to multiply are 6.6359516e+21 and 6456577120. However, I do not seem to be able to multiply these numbers, on my standard CASIO calculator. Could someone kindly give an insight as to how to multiply these numbers on a calculator, if it is, by any chance, feasible?

  • 1
    $\begingroup$ Use this property : $(a\times 10^b ) \times c = (a \times c) \times 10^b$. $\endgroup$
    – nicomezi
    Commented Apr 14, 2019 at 7:17
  • $\begingroup$ I can do it with my ALGEBRA FX 2.0Plus $\endgroup$ Commented Apr 14, 2019 at 7:25
  • $\begingroup$ Enter the second number also in scientific notation : $$6.45657712e+09$$ $\endgroup$
    – Peter
    Commented Apr 14, 2019 at 7:50


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