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Regrouping in subtraction - 2nd grade (2-digit numbers)

First I show with a visual model what REGROUPING actually means in itself (before we get into subtracting). One TEN is "broken down" into TEN ONES. We practice that concept with an example, changing 7 tens 6 ones into 6 tens 16 ones (the regrouping process).

Then I also involve subtraction. We regroup (aka borrow), then subtract 2-digit numbers. Before showing the regular way this is written down (with one number under the other), I use a model based on place value for a few exercises. For example:

7 tens 0 ones is regrouped as 6 tens 10 ones.

Then we subtract:

  6 tens 10 ones
- 4 tens  8 ones
----------------------------
  2 tens  2 ones

Lastly we get into the regular way of writing the subtraction, such as:

   62
-  27
-------

If you cannot see the video above, click here for an alternative video player.




This second video lesson provides more practice and examples of regrouping (borrowing) in subtraction, with 2-digit numbers. I also show and emphasize the importance of checking your answer by ADDING.


If you cannot see the video above, click here for an alternative video player.



See also

Mental addition of two-digit numbers

Math Mammoth Grade 2 curriculum

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