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Add 6.75xx10^3 cm to 4.52xx10^2 cm....

Add `6.75xx10^3 cm to 4.52xx10^2 cm.`

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`x = 6.75xx10^3, y= 4.52xx10^2 cm`
`= 0.452xx10^3 cm`
`x +y = (6.75xx10^3 + 0.452xx10^3)cm`
`= 7.202xx10^3 cm = 7.20xx10^3 cm`
(upto two places of decimal.)
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