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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 -------------