Mr. Gibson Science Classes – all disciplines
September 12th & 13th
SY-2011/2012
Sig. FigsAddition & SubtractionAdding
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 5.355 cm
+ 5.68 cm = ? cm
Step 1: Carry out the addition first…
Sig. FigsAddition & SubtractionAdding
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 5.355 cm
+ 5.68 cm = 16.035 cm
Step 1: Carry out the addition first…
Sig. FigsAddition & SubtractionAdding
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 5.355 cm
+ 5.68 cm = 16.035 cm
Step 2: Locate the number in the group being added together that has the fewest decimal places.
Sig. FigsAddition & SubtractionAdding
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 5.355 cm
+ 5.68 cm = 16.035 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. FigsAddition & SubtractionAdding
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 5.355 cm
+ 5.68 cm = 16.0 cm
In this example the answer will only have one decimal place just like 5.0 in the problem did.
Sig. FigsAddition & SubtractionAdding
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.
10.2 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. FigsAddition & 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.
10.2550 cm
- 5.005 cm = 5.2500 cm
Step 1: subtract the numbers;
Sig. FigsAddition & 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.
10.2550 cm - 5.005 cm = 5.2500 cm
Step 2: Find the number with the smallest number of decimal places;
Sig. FigsAddition & 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.
10.2550 cm - 5.005 cm = 5.2500 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. FigsAddition & 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.
10.2550 cm - 5.005 cm = 5.250 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. FigsAddition & 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.
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