This math chapter workbook on "Subtraction up to 1,000," reviews subtracting within smaller number ranges, such as up to 100. It then introduces the concept of place value as it applies to subtraction involving hundreds, tens, and ones. The workbook provides a variety of practice problems that include subtracting two- and three-digit numbers, both with and without regrouping. Word problems are incorporated to help students apply subtraction skills in real-world scenarios.