This combo book Math Grade 1 & Story Problems Grades 1-2 provides the problems and the answer key at the end of each section. Parent Note-The I Know It! mathematics series has been written by math specialists to emphasize the sequential steps and basic objectives at each grade. These objectives, which appear at the bottom of the workbook pages, relate to the most widely used texts and describe what the child is learning on each page. Each Combo Book combines two key I Know It! workbooks under one cover. Math Grade 1 focuses on math skills children need for success in first grade. The story problems in Story Problems Grades 1-2 build in complexity from easy to challenging. Since math requires that skills be mastered in sequence, the order of learning is important. If your child has trouble working at this grade level, we suggest you try one of the earlier grade level books.