Unit (symbol)                          How many meters 1 unit contains       How many units 1 meter contains
Kilometer (km)                         1 km = 1,000 m                        1 m = 0.001 km
 Hectometer (hm)                        1 hm = 100 m                          1 m = 0.01 hm
 Dekameter (dam)                        1 dam = 10 m                          1 m = 0.1 dam
 Meter (m)                              1m=1m                                 1m=1m
 Decimeter (dm)                         1 dm = 0.1 m                          1 m = 10 dm
 Centimeter (cm)                        1 cm = 0.01 m                         1 m = 100 cm
 Millimeter (mm)                        1 mm = 0.001 m                        1 m = 1,000 mm
Unit (symbol)                            How many liters 1 unit contains      How many units 1 liter contains
Liter (L)                                1L=1L                                1L=1L
Deciliter (dL)                           1 dL = 0.1 L                         1 L = 10 dL
Centiliter (cL)                          1 cL = 0.01 L                        1 L = 100 cL
Milliliter (mL)                          1 mL = 0.001 L                       1 L = 1,000 mL
 Unit (symbol)                           How many grams 1 unit contains       How many units 1 gram contains
 Kilogram (kg)                           1 kg = 1,000 g                       1 g = 0.001 kg
 Hectogram (hg)                          1 hg = 100 g                         1 g = 0.01 hg
 Dekagram (dag)                          1 dag = 10 g                         1 g = 0.1 dag
 Gram (g)                                1g=1g                                1g=1g
 Decigram (dg)                           1 dg = 0.1 g                         1 g = 10 dg
 Centigram (cg)                          1 cg = 0.01 g                        1 g = 100 cg
 Milligram (mg)                          1 mg = 0.001 g                       1 g = 1,000 mg
                                                          TIME
      60 seconds (s) = 1 minute (min)                        365 days = 1 common year
      60 minutes (min) = 1 hour (h)                          366 days = 1 leap year
      24 hours (h) = 1 day (d)                               12 months = 1 year
      7 days (d) = 1 week (wk)                               10 years = 1 decade
      30 days (d) = 1 month (mo)                             20 years = 1 score
      52 weeks (wk) = 1 year (yr)                            100 years = 1 century