Mr. Gibson Science Classes – all disciplines September 12 th & 13 th SY-2011/2012.

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  Non-zero digits are significant.  Ex: 453 kg  All non-zero digits are always significant  # of Sig Fig’s?  3! Rule 1:

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Mr. Gibson Science Classes – all disciplines September 12 th & 13 th SY-2011/2012

Sig. Figs Addition & Subtraction Adding Expanded numbers with proper number of Sig Figs in the sum. _______________ We will add the following three numbers shown to the right to illustrate the rules for sig. figs. 5.0 cm cm cm = ? cm Step 1: Carry out the addition first…

Sig. Figs Addition & Subtraction Adding Expanded numbers with proper number of Sig Figs in the sum. _______________ We will add the following three numbers shown to the right to illustrate the rules for sig. figs. 5.0 cm cm cm = cm Step 1: Carry out the addition first…

Sig. Figs Addition & Subtraction Adding Expanded numbers with proper number of Sig Figs in the sum. _______________ We will add the following three numbers shown to the right to illustrate the rules for sig. figs. 5.0 cm cm cm = cm Step 2: Locate the number in the group being added together that has the fewest decimal places.

Sig. Figs Addition & Subtraction Adding Expanded numbers with proper number of Sig Figs in the sum. _______________ We will add the following three numbers shown to the right to illustrate the rules for sig. figs. 5.0 cm cm cm = cm Step 3: round off the answer so that it has the SAME number of decimal places as the number in the problem with the fewest.

Sig. Figs Addition & Subtraction Adding Expanded numbers with proper number of Sig Figs in the sum. _______________ We will add the following three numbers shown to the right to illustrate the rules for sig. figs. 5.0 cm cm cm = 16.0 cm In this example the answer will only have one decimal place just like 5.0 in the problem did.

Sig. Figs Addition & Subtraction Adding Expanded numbers with proper number of Sig Figs in the sum. _______________ We will add the following three numbers shown to the right to illustrate the rules for sig. figs cm 10.0 cm + 10 cm = ? cm Step 1: Add up the numbers; Step 2: Find the number with the smallest number of decimal places; Step 3: Round-off the answer so that its decimal places = the number in the problem with the lowest decimal places.

Sig. Figs Addition & Subtraction Subtracting Expanded numbers with proper number of Sig Figs in the sum. _______________ We will add the following three numbers shown to the right to illustrate the rules for sig. figs cm cm = cm Step 1: subtract the numbers;

Sig. Figs Addition & Subtraction Subtracting Expanded numbers with proper number of Sig Figs in the sum. _______________ We will add the following three numbers shown to the right to illustrate the rules for sig. figs cm cm = cm Step 2: Find the number with the smallest number of decimal places;

Sig. Figs Addition & Subtraction Subtracting Expanded numbers with proper number of Sig Figs in the sum. _______________ We will add the following three numbers shown to the right to illustrate the rules for sig. figs cm cm = cm Step 3: Round off your answer such that it is the same as the number in the problem with the smallest number of decimal places;

Sig. Figs Addition & Subtraction Subtracting Expanded numbers with proper number of Sig Figs in the sum. _______________ We will add the following three numbers shown to the right to illustrate the rules for sig. figs cm cm = cm Step 3: Round off your answer such that it is the same as the number in the problem with the smallest number of decimal places;

Sig. Figs Addition & Subtraction Adding Expanded numbers with proper number of Sig Figs in the sum. _______________ Now go get a Chemistry text book – turn to page 41 and do problems 35 & 36. Be prepared to put your work on the board when called. Step 1: Find the number with the smallest number of decimal places; Step 2: Add up or subtract the numbers as indicated by the problem; Step 3: Round-off the answer so that its decimal places = the number in the problem with the lowest decimal places.