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Determining Sig Figs. When given any number, there are rules that can be followed to determine how many digits within that number are “precision” digits, also known as Significant Figures. Determining Sig Figs. Let’s look at the 5 rules of Sig Figs: The first rule is the easiest:
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Determining Sig Figs • When given any number, there are rules that can be followed to determine how many digits within that number are “precision” digits, also known as Significant Figures.
Determining Sig Figs • Let’s look at the 5 rules of Sig Figs: • The first rule is the easiest: • All numbers that are non-zero numbers are ALWAYS sig figs. • Underlining the digits that are significant might help you remember they are significant.
Determining Sig Figs • Underline the non-zero digits: • 1492 • 101 • 200 • 0.005 • 0.750 • 102.070
Determining Sig Figs • Underline the non-zero digits: • 1492 (all of these are sig figs) • 101 (both of the 1’s are sig figs) • 200 (only the 2) • 0.005 (only the 5) • 0.750 (only the 7 and the 5) • 102.070 (only the 1, 2, and 7)
Determining Sig Figs • What do we do with all the zeros?? • There are 4 “zero rules” • Zero rule #1: the Sandwich rule • If a zero is anywhere between two sig figs, it is also a sig fig
Determining Sig Figs • Underline the sandwich zeros: • 1492 • 101 • 200 • 0.005 • 0.750 • 102.070
Underline the sig figs and sandwich zeros: • 1492 • 101 • 200 • 0.005 • 0.750 • 102.070
Determining Sig Figs • Zero rule #2: the Trailing Zero rule • Zeros that fall behind a sig fig bit are in front of the understood decimal point are NOT sig figs.
Underline sig figs and cross out any trailing zeros: • 1492 • 101 • 200 • 0.005 • 0.750 • 102.070
Determining Sig Figs • Underline sig figs and cross out any trailing zeros: • 1492 • 101 • 200 • 0.005 • 0.750 • 102.070
Determining Sig Figs • Zero rule #3: the Leading zero rule • Zeros that fall behind the decimal but are in front of a sig fig are NOT sig figs.
Determining Sig Figs • Underline the sig figs and cross out the leading zeros: • 1492 • 101 • 200 • 0.005 • 0.750 • 102.070
Underline sig figs and cross out any leading zeros: • 1492 • 101 • 200 • 0.005 • 0.750 • 102.070
Determining Sig Figs • Zero rule #4: the Precision rule • Zeros that fall behind the decimal AND are behind a sig fig ARE sig figs.
Determining Sig Figs • Underline the sig figs and precision zeros: • 1492 • 101 • 200 • 0.005 • 0.750 • 102.070
Determining Sig Figs • Underline sig figs and precision zeros: • 1492 • 101 • 200 • 0.005 • 0.750 • 102.070
Determining Sig Figs Tell me how many sig figs are in each example. • 1492 • 101 • 200 • 0.005 • 0.750 • 102.070
Tell me how many sig figs are in each example. • 1492 (4 sig figs) • 101 (3 sig figs) • 200 (1 sig fig) • 0.005 (1 sig fig) • 0.750 (3 sig figs) • 102.070 (6 sig figs)
Things to remember… • Once you call a number a sig fig, you can’t undo it by a later rule. • Always follow the rules as you determine sig figs