When adding whole numbers 
be sure that you ALWAYS  
have the place value columns lined up 
(ie: ones, tens, hundreds, etc.),

243 + 436=

then add each column 
starting with the ONES column, 
and move left.

  2 4 3
+4 3 6
  6 7 9

3,484 + 2,313 =

    3, 4 8  4                             ones             tens           hundreds       thousands
+  2, 3  1  3      add each column:   4+3=7,  8+1=9,  4+3=7,  3+2=5
      5, 7 9  7                                                  

                     so,  3,484 + 2,313 = 5,797

Examples: 

   372                               836                          624
+524                             +112                        +235
  896                               948                          859

REMEMBER:

  ALWAYS  
have the place value columns lined up 
(ie: ones, tens, hundreds, etc.)

then add each column 
starting with the ONES column, 
and move left.

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