Arithmetic Grade Four

Lesson Twenty-six: Carrying

Now for something a little more challenging. Take a look at this example: 

   458
  +275
  ----
STEP ONE: Add the numbers in the ones column. If the the answer is greater than 9, then we must carry: 

    1
   458
  +275
  ----
     3
We get 13. We place the 3 in the tens column and we carry the one:

STEP TWO: Add up the tens column: 


   11
   458
  +275
  ----
    33
STEP THREE: Add the numbers in the hundreds column: 

   11
   458
  +275
  ----
   733

Here's another example: 


   105
  +817
  ----
STEP ONE: Since the 5 and 7 in the ones column adds up to 12 and 12 is greater than 9, we must carry. 

    1
   105
  +817
  ----
     2
STEP TWO: Adding up the numbers in the tens column we get 2. 

    1
   105
  +817
  ----
    22
STEP THREE: Adding up the numbers in the hundreds column we get 9. 

    1
   105
  +817
  ----
   922

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