异分母分数加法
Adding Fractions (Unlike Denominators)
通过将给定的分数替换为等值分数，得到公分母，从而进行异分母分数（包括带分数）的加减运算。
Add and subtract fractions with unlike denominators (including mixed numbers) by replacing given fractions with equivalent fractions to produce a common denominator
学习证据 / Evidence
- 通过转换为十二分之几来计算 2/3 + 5/4：8/12 + 15/12 = 23/12
- 利用公分母计算 3 1/4 减 1 3/5
- 解释寻找公分母的策略，并用直观模型进行验证
- Compute 2/3 + 5/4 by converting to twelfths: 8/12 + 15/12 = 23/12
- Subtract 1 3/5 from 3 1/4 using a common denominator
- Explain the strategy of finding a common denominator and verify using a visual model
评估问题 / Assessment
如果一个食谱需要 2/3 杯的一种原料和 3/4 杯的另一种原料，{{name}}能把这两个分数加在一起吗——即使它们的分母不同？
If a recipe uses 2/3 of a cup of one ingredient and 3/4 of another, can {{name}} add those fractions together — even though the denominators are different?