Column Method — Addition & Subtraction
Operation:
Add
Subtract
Mixed
Digits:
2
3
4
5
Regrouping:
Any
Require
Forbid
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Attempt
0
/2
Correct column
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Tip: Check your carry/borrow
7
8
9
⌫
4
5
6
Clear
1
2
3
←
0
OK
→