I recommend getting one of these books when you first begin homeschooling and use it as a reference throughout your homeschool journey. Regardless of how long you homeschool, you'll always have doubts and questions about how your child is performing.A scope and sequence book can put your mind at ease.
Subtract 1-, 2-, or 3-digit numbers from 3- and 4-digit number with/without renaming
Or you can usually find textbooks and workbooks at the public library, where you can also copy any worksheets that you want to use.
However for the most part, when a worksheet is needed to help drill down a procedure, standard, or lesson, its effectiveness can and will vary.