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Shortcuts in Addition

 By Monica Yuskaitis
Adding Long Columns
• Since addition is Commutative it
 doesn’t matter which numbers you
 add first.

     4 + 2 + 5 + 1 = 12
     1 + 4 + 5 + 2 = 12
Adding Long Columns
• Begin by looking for combinations
 of ten.
                34
                57
                83
              + 26
Adding Long Columns
• Add up your ten combinations
 first.            2
                   34
                   57
                   83
                 + 26
                    0
Adding Long Columns
• Add up your ten combinations
 again.         2
                34
                57
                83
              + 26
              200
Review Combinations of Ten
•1 +   9   = 10   5+   5   = 10
•8 +   2   = 10   7+   3   = 10
•2 +   8   = 10   6+   4   = 10
•4 +   6   = 10   3+   7   = 10
•9 +   1   =10
Adding Long Columns
• When a number keeps repeating
 use multiplication.    2
                         32
                         36
                         88
                         26
                       +
                         36
                            8
Adding Long Columns
• When a number keeps repeating
 use multiplication.     2
                         32
                         36
                         88
                         26
                       + 36
                       218

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