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Add 6.65xx10^(4) and 8.95xx10^(3)....

Add `6.65xx10^(4)` and `8.95xx10^(3)`.

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Exponent is made same for the both numbers
`6.65 xx 10^(4) +0.895 xx 10^(4)=7.545 xx 10^(4)`
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