Making worksheets is a tedious process...so use ours! This product is 40-pages in length, containing 20 unique worksheets with a separate answer key for each worksheet. Each of the 20 worksheets has 25 problems, and the 25 problems are an equal mix of addition and subtraction problems. Each problem contains numbers that are 3 digits in length (919, 616, 213, etc.), although the final answer may be up to 4 digits in length in some cases (1011, 1215, etc.). A space for name and date are at the top, and color has been removed for the sake of your printer and/or copier. Enjoy!