I created a subtraction unit. It has 2 pretests/posttests each with 12 word problems. There are 8 practice pages each with 5 word problems. Last, there are 4 basic subtraction quizzes that have 5 subtraction problems with places to check each problem with addition. Therefore, it totals 10 questions per quiz. They all include subtraction from 2 digit up to 4 digit.
I teach 3rd grade in VA. This matches the SOL 3.4 for subtraction.