Adding Three Digit Numbers

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

Home Page