Even Numbers- 0     2         4       6    8
Odd Numbers- 1      3         5       7    9
Prime Numbers Between 1-100
      2      3      5         7       11   13   17   19     23     29     31      37
41    43     47     53        59      61   67   71   73     79     83     89      97
Measures of time                                     Measures of length
      60 seconds= 1 minute                           1 kilometer ( km)= 1000 meters(m)
      60 minutes=1 hour                              1 hectometer (hm)= 100 meters (m)
      24 hours= 1 day                                1 dekameter (dkm)= 10 meters (m)
      7 days= 1 week                                 1 decimeter (dm)= 0.1 meter (m)
      30 days= 1 month                               1 centimeter (cm)= 0.01 meter(m)
      365 days= 1 common year                        1 millimeter (mm)= 0.001 meter(m)
      366 days= 1 leap year                          10 decimeters (dm)=1 meter (m)
      52 weeks= 1 year                               100 centimeters(cm)= 1 meter (m)
      12 months= 1 year                              100 millimeters (mm)= 1 meter (m)
      10 year= 1 decade                              1 decimeter (dm)= 10 centimeters (cm)
      100 years= 1 century
      1000 years= 1 millennium
Measure of Mass
      1 kilogram(kg)=1000 grams (g)                  100 centigrams (cg)= 1 gram (g)
      1 hectogram (hg)= 100 grams (g)                1000 milligrams (mg)= 1 gram (g)
      1 dekagram (dkg)= 10 grams (g)
      1 decigram (dg)= 0.1 gram (g)
      1 centigram (cg)= 0.01 gram (g)
      1 milligram (mg)= 0.001 gram (g)
      10 decigram (dg)= 1 gram (g)
PERIMETER
Square = 4 X side
Rectangle = 2 ( length + width)
Triangle = side+ side + side or 3 X side
AREA
Square = side X side
Rectangle = length X width
Triangle = base X height
Parallelogram = base X height
Trapezoid = ( b1+ b2) X height
Circle =л r    л is equal to 3.14
Cicumference of a circle 2лr 0r лd d is the diameter