**Problem : ** Compute 3.45×10^{1}6 + 9.80×10^{1}8.

**Problem : ** Compute 6.12×10^{-2} -4.9×10^{-4}.

**Problem : ** Compute 4.0219×10^{4} +6×10^{-3}.

**Problem : ** Compute 6.1×10^{2} -4.38×10^{4}.

**Problem : ** Compute 9.9×10^{-18} +4.2×10^{-19}.

**Problem : ** Compute 1.02×10^{1}2 - 4.5×10^{1}0.

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Multiplication and Division in Scientific Notation