68 + 43 = 111 2 - Digit Addition
68 -> 60 + 8
+43 -> 40 + 3
100 + 11
100 + 11 = 111
------------------------------------------
168 + 43 = 211 3 - Digit Addition
1 68 -> 100 + 60 + 8
+ 43 -> 0 + 40 + 3
100 + 100 + 11
100 + 100 = 200
200 + 11 = 211
--------------------------------------------
168 - 43 = 3 - Digit Subtraction Without Regrouping
1 68 -> 100 + 60 + 8
- 43 -> - 0 - 40 - 3
100 + 20 + 5
100 + 20 = 120
120 + 5 = 125
------------------------------------------------
163 - 78 = 3 - Digit Subtraction With Regrouping
+100 150
0 50 +10 13
1 68 -> 100 + 60 + 3
- 73 -> - 0 - 70 - 8
0 + 80 + 5
80 + 5 = 85