Combine Without Using a Calculator$\left(6.42 \times 10^{-2}\right)-$ $\left(5 \times 10^{-4}\right)+\left(9 \times 10^{-3}\right)$

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The Answer of Combine Without Using a Calculator$\left(6.42 \times 10^{-2}\right)-$ $\left(5 \times 10^{-4}\right)+\left(9 \times 10^{-3}\right)$

Combine Without Using a Calculator $\left(6.42 \times 10^{-2}\right)-$ $\left(5 \times 10^{-4}\right)+\left(9 \times 10^{-3}\right)$