Print target
A
287
B
630
Id
C11
Job
missing_addend
Reason
Box is the missing part, not 630.
Complete source
A fictional print target is 630 cards, 287 available: 287+□=630.
Status
Original fictional ordinary practice; teach source/help before any own application.
Title
Print target
After own work: adult practice possibility
343 needed; 287+343=630.