Find the number of significant figures in the following numbers.
(i) 6729 , (ii) 0.024 ,(iii) 6.0023 , (iv) `2.520 xx 10^7` , (v) 0.08240
(vi) 4200 , (vii) `4.57xx10^8` , (viii) 91.000

Explanation

Significant figures.
(i) 6729 `" "` 4
(ii) 0.024 `" "` 2
(iii) 6.0023 `" "` 5
(iv) `2.520xx10^7` `" "`4
(v) 0.08240 `" "` 4
(vi) 4200 `" "` 2
(vii) `4.57xx10^8 ` `" "`3
(viii) 91.000 `" "` 5