Conceptual knowledge of fraction arithmetic.

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Teacher Knowledge Experiment: Testing Mechanisms Underlying the Formation of Preservice Elementary School Teachers’ Pedagogical Content Knowledge Concerning Fractions and Fractional Arithmetic (2018, background): “Furthermore, common arithmetical errors and corresponding teaching approaches for addition and multiplication with fractions were shown (e.g., Mack, 1995; Siegler & Lortie-Forgues, 2015).”
Why Is Learning Fraction and Decimal Arithmetic so Difficult (2015, methodology): “We conducted a small experiment on understanding of multiplication and division of decimals between 0 and 1 with 10 undergraduates from the same university as the one attended by the pre-service teachers in Siegler and Lortie-Forgues (2015).”
Hard Lessons: Why Rational Number Arithmetic Is So Difficult for So Many People (2017, background): “For example, many preservice teachers in Siegler and Lortie-Forgues (2015) had excellent fraction magnitude knowledge but poor fraction arithmetic knowledge.”
Putting fractions together. (2020, background): “Beyond their difficulties calculating exact answers to fraction arithmetic problems, many children lack a sense of the approximate sizes of the answers (Hecht, 1998; Hecht & Vagi, 2012; Siegler & Lortie-Forgues, 2015).”