Adding Three Digit Numbers

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In 2nd grade you will learn adding three digit numbers. There are some steps to follow with an example. 324 + 126.
• Write the given numbers one below the other in such a way that hundreds, tens and one places are lined up. Draw the line after lining up and put the plus sign on the left side of 2nd number.
   H   T    O
   3    2    4
+1    2    6 
 -------------
• Add one place digits ( 4 + 6 = 10) This number is two digit number so place one's place digit from 10 ( 0) in one's place column and place ten's digit number (1) above 2 in tens column.
        1
   H   T    O
   3    2    4
+1    2    6 
 -------------
               0
• Add all tens digit numbers ( 1+ 2 + 2 = 5). Write this number below tens digit column.
        1
   H   T    O
   3    2    4
+1    2    6 
 -------------
         5    0
• Finally add all the digit from hundreds column.( 3 + 1 = 4)

Example 1 : Add 764 + 358
    1    1   
    7    6    4
 + 3    5    8 
 -------------
  1 1   2    2

Example 2 : 907 + 564
          1
    9    0    7
 + 5    6    4 
 ----------------
  1 4   7    1

Example 3: 600 + 400
    6    0    0
+ 4    0    0 
 ----------------
  1 0   0    0

Practice

    6    6    4
 + 3    7    8 
 -------------

    8    2    4
 + 3    6    8 
 -------------

    9    6    4
 + 2    1    5 
 -------------

    4    3    8
 + 2    5    8 
 -------------

    6    6    1
 + 3    5    9 
 -------------

    1    6    4
 + 9    5    8 
 -------------

    3    6    4
 + 3    5    1 
 -------------

    5    5    5
 + 1    9    8 
 -------------

    4    6    7
 + 1    6    9 
 -------------

    8    2    7
 + 4    5    5 
 -------------

    8    8    4
 + 2    7    8 
 -------------

    9    9    4
 + 1    9    0 
 -------------

    2    3    8
 + 3    7    5 
 -------------

    4    0    8
 + 1    9    6 
 -------------

    8    8    8
 + 7    7    7 
 -------------


Adding three digit numbers

2nd Grade Math

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