Kinesthetic math: Regrouping

Today we worked on regrouping using Math-U-See manipulatives. We used just the 100s, 10s, and unit pieces.  I drew a large grid for spaces for each of the numerals, and used problems in our Brainquest workbook. We added the units together, trading them out for tens if we had more than 10, then placing that ten above the two other rows, just as you would when writing it out. Then we did the same with the tens bars, pulling out groups of ten tens and then placing the new 100 plate above the 100s place of our rows. We then wrote out what we did in the workbook.

Subtracting with regrouping was a little different. We took away the number of units in the second row from the units in the top row, and moved the remaining units to the bottom (answer) row. If there weren't enough units in the top row, we converted a tens bar into 10 units cubes and put them in that upper right square. We then subtracted how many we had un the middle right square and put the remaining units cubes in the bottom right box. We repeated this substitution and removing manipulatives until we had our answer, and then wrote out what we did in the workbook. 

I only spent about 15 minutes doing this activity. We will come back to it until it clicks and my son is completely comfortable with regrouping in concept and in writing it out.