Take for example the multiplication of fractions. The old texts just gave students a direct rule to follow: "In multiplying fractions, first, turn all mixed fractions into improper fractions. Then multiply numerators times numerators, and denominators by denominators."
例如高年級的分數乘法概念，課本直接歸納出規則，「分數乘式之中，如果有帶分數，可先把帶分數化為假分數，然後分子乘分子，分母乘分母」。