1. And all things numeric

2.  Students will…  …be able to distinguish between accuracy and precision.  …be able to identify the correct number of significant figures.  …conduct mathematical operations with significant figures.  …convert measurement into and from scientific notation.  …identify direct and inverse proportions.

4.  Accuracy is close to the true answer,  Precise is to have several trails close to one another,  Both are desired for good science and neither is much good alone.

5.  Zeros between non-zero numbers are significant.  Zeros appearing right of a decimal point but before a non-zero number are not significant.  Zeros after a non-zero number and after a decimal point are significant.  Zeros at the start or end part of an exact number are significant, but zeroes in the front or rear of an estimate are not.

6.  10002  20000 measured  About 350 .00054  Measured at 1.0010  Roughly.0250  350500

7.  5 or greater round up  4 or less round down  So if we need 3 significant figures…  234.5  0.0034611  4.009

8.  Your answer can not have more sig figs to the right of the decimal than the smallest number of sig figs in the numbers used.  200.0 miles (exact) - 72.1 miles (estimate) = 127.9 miles answer in 3 sig figs.

9.  Your answer can not have more sig figs than the smallest number of sig figs in the numbers used.  1.0034 x 2.005 = 2.118 -> 2.12

10.  Count the number of digits.  Write the number as the first single digit followed by a decimial and the next few numbers.  Write x10 raised to the power = the number of digits before the decimal you removed.  Works the same for small decimals that you make into closer to whole number equivalentals.

11.  120000 =>  12345 =>  0.00978 =>

12.  Two values are directly proportional if as one is divide by the second, the result is a constant value.  y/x = K  As I eat more, I get bigger.

13.  Two values are indirectly proportional if as they are multiplied their product is constant.  Y ∝ 1/x  As I work less, I have more free time.