Learn math without fear, Stanford expert says
People with “number sense” are those who can use numbers flexibly, she said. For example, when asked to solve the problem of 7 x 8, someone with number sense may have memorized 56, but they would also be able to use a strategy such as working out 10 x 7 and subtracting two 7s (70-14).
When students are stressed – such as when they are solving math questions under time pressure – the working memory becomes blocked and the students cannot as easily recall the math facts they had previously studied. This particularly occurs among higher achieving students and female students.
Some estimates suggest that at least a third of students experience extreme stress or “math anxiety” when they take a timed test, no matter their level of achievement. “When we put students through this anxiety-provoking experience, we lose students from mathematics.”
Fluency Without Fear: Research Evidence on the Best Ways to Learn Math Facts
Stanford

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