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Lesson VI: Addition and Subtraction; Modern Learning Aids; A Brief Course in Mathematics for Elementary School Teachers; Lesson VI: Addition and Subtraction
Lesson XV: Metric Properties of Figures; Modern Learning Aids; A Brief Course in Mathematics for Elementary School Teachers; Lesson XV: Metric Properties of Figures
Lesson XXI: Multiplication of Rational Numbers; Modern Learning Aids; A Brief Course in Mathematics for Elementary School Teachers; Lesson XXI: Multiplication of Rational Numbers
Lesson XXIX: Negative Rational Numbers; Modern Learning Aids; A Brief Course in Mathematics for Elementary School Teachers; Lesson XXIX: Negative Rational Numbers