Elementary School, Primary School, Middle School.
Blanks in columnar addition to be filled in correctly.
A columnar addition problem with positive natural numbers is shown, the both the summands and the sum. Some places have been replaced by blanks. These have to be filled in correctly.
The number of summands and the number of the summands' places can be chosen.
With respect to carries, it may be specified that
Optionally, the numbers to be filled in can be shown in the form of a sorted list.
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