Solve with due regard to significant figures.
(i) `46.7 - 10.4 = " "` (ii) `(3.0 xx 10^(-8)) + (4.5 xx 10^(-6)) = `

Explanation

(i) `46.7 - 10.04`
Here 46.7 has one decimal place, and 10.04 has two decimal places.
`therefore 46.7 - 10.04 = 36.66`
The result should have only one decimal place.
The result is 36.7.
(ii) `3.0 xx 10^(-8) + 4.5 xx 10^(-6)`
`= 0.03 xx 10^(-6) + 4.5 xx 10^(-6)`
`= 4.53 xx 10^(-6)`
Here ` 4.5 xx 10^(-6)` has only one decimal place and `0.03 xx 10^(-6)` can have two decimal places.
This result should be rounded off to one decimal place.
`therefore (3.0 xx 10^(-8) ) + (4.5 xx 10^(-6) ) = 4.5 xx 10^(-6)`