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Question II.2: Add or subtract:

Add or subtract:

(a)\ 320.0|84 \hspace{20 pt} (b)\ 61|.4532\\ \hspace{21 pt}80.4|7\hspace{39 pt} 13|.7\\ \hspace{16 pt}200.2|3 \hspace{39 pt} 22| \hspace{40 pt} (c)\ 14.26| \\ \underline{\hspace{21 pt}20.0| \hspace{49 pt} 0|.003 \hspace{30 pt} -1.05|041} \\ \hspace{16 pt}620.8| \hspace{43 pt} 97| \hspace{55pt} 13.21|
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In each case, we add or subtract in the normal way but then round off so that the only digits that appear in the answer are those in the columns in which every digit is significant.

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