0.032198 1significant figure 2 significant figure 3 significant figure .?

0.032198 = 0.03 (to 1 sig. fig.)
0.032198 = 0.032 (to 2 sig. fig.)
0.032198 = 0.0322 (to 3 sig. fig.)

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0.032198 = 0.03220 (to 4 sig. fig.)
理由：
要 4 sig. fig. => delete 尾數 "8" => 進 1 至前一數 "9"
=> 9+1 變 "0"，且進 1 至 前 1 數字 "1"
=> 1+1 = 「2 」( 即 0.032「2」0 )