• Doubles -- should be memorized for quick recall, sum is always even, and the pattern is counting by 2man

     0 + 0 = 0

    1 + 1 = 2

    2 + 2 = 4

    3 + 3 = 6

    4 + 4 = 8 

    5 + 5 = 10

     6 + 6 =12

    7 + 7 =14

    8 + 8 = 16

    9 + 9 = 18 

    10 + 10 = 20

    11 + 11 = 22 

    12 + 12 = 24 

     
     
     
     
     
     
Last Modified on February 1, 2018