Developmental Mathematics Student Workbook Level 14 Fractions Concepts and Skills Author:L. George Saad Grade 7, Semester 2 - Level 14. Fractions: Concepts and Skills Level 14. Fractions: Concepts and Skills covers the concepts and symbols of fractions and mixed numbers and applies the addition, subtraction, multiplication, and division operations to fractions. Level 14 applies adding, subtracting, multiplying, and dividing to fractions of the s... more »ame unit and whole numbers.« less