41 books • 10 series
Book #7: Decimal Numerals
Book #4: Division of Whole Numbers
Book #9: Formulas & Applications
Book #5: Fractions & Fractional Numbers
Book #10: Measurement & Applications
Book #11: Measurement in Geometry
Book #3: Multiplication of Whole Numbers
Book #1: Numbers & Numerals
Book #8: Percents & Applications
Book #12: Units of Measure & the Metric System