Learning to Add
  Instruction                 Easy             Challenge     Mental process
Adding Zero               Quiz 1            Quiz 1               zero/ten
Adding Ten                 Quiz 2            Quiz 2
    Number Structure
Adding One                Quiz 3            Quiz 3               one/two
Adding Nine               Quiz 4            Quiz 4               nine
    Count Back
    Nine Rule
Adding Two                Quiz 5           Quiz 5
Adding Eight              Quiz 6            Quiz 6               eight
    Eight Rule
Adding Five                Quiz 7            Quiz 7               five
    Nickel Rule
    Nickel Rule 1
    Nickel Rule 2
The Rest                      Quiz 8            Quiz 8               others
Sum to Ten                  Quiz 9            Quiz 9               ten
Doubles                       Quiz 10          Quiz 10             Doubles
     Weighing Water
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