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Is the vertical calculation of mathematics addition and subtraction in the second grade of primary school a written test or a test?
Just write a check to verify that you have done this problem correctly. Based on this method:

Addition: Appendix+Appendix = Sum.

1, recalculate the position where the addend can be exchanged;

2. Use and subtract one of the addends and the other addend that should be added to make it correct.

Subtraction: subtraction-subtraction = difference

1, the minuend minus the difference should be equal to the minuend;

2. subtraction+difference should be equal to the minuend.