3. Confusing Measurements

4. French National Assembly Academy of Sciences

5. Metric System  Insured worldwide standard

6. Quadrant Surveyors JBJ Delambre PFA Mechain

7. Measuring the Quadrant

8. Early Researchers J.R. Benoit

9. Excited Cadmium Atoms Wavelength

10. Defined By Light

11. Meter Stick  1 meter = 3.28 feet

13. mm And cm

15. tera- (T-)10 12 1 trillion giga- (G-)10 9 1 billion mega- (M-)10 6 1 million kilo- (k-)10 3 1 thousand hecto- (h-)10 2 1 hundred deka- (da-)**101 ten deci- (d-)10 -1 1 tenth centi- (c-)10 -2 1 hundredth milli- (m-)10 -3 1 thousandth micro- ( µ -)10 -6 1 millionth nano- (n-)10 -9 1 billionth Prefixes

16.  Metric Prefixes can be used with any base unit.

18. Metric Prefixes

19. Teaching Prefixes Learn the 16 regular prefixes by counting Change them by jumping the decimal point 3 places Don ’ t call this “ converting units ” Set calculator display to ENG Avoid the irregular prefixes (h, da, d, c) except in cm, cm2, cm3, dm3, hm2, hm3

20. Advantages of Metrics No conversions No fractions No numbers to memorize No awkward rows of zeroes Complete Coherent Unambiguous symbols Only 30 units The world standard

22.  The meter is the length of the path travelled by light in a vacuum during a time interval of 1/299 792 458 of a second. (1983)