分数应用题
Fraction Word Problems
解决涉及异分母分数加减法的应用题，能借助直观模型和基准分数进行估算，并判断答案是否合理。
Solve word problems involving addition and subtraction of fractions with unlike denominators, using visual models and benchmark fractions to estimate and assess reasonableness
学习证据 / Evidence
- 解答：'Tara吃了2/5个披萨，Sam吃了1/3个披萨，他们一共吃了多少？'
- 能认识到2/5 + 1/2 ≠ 3/7，因为3/7 < 1/2，而两个分数的和应大于1/2。
- 在精确计算之前，能利用基准分数（0、1/2、1）估算分数和。
- Solve: 'Tara ate 2/5 of a pizza and Sam ate 1/3. How much did they eat together?'
- Recognise that 2/5 + 1/2 ≠ 3/7 because 3/7 < 1/2 but the sum should exceed 1/2
- Estimate a fraction sum using benchmarks (0, 1/2, 1) before computing exactly
评估问题 / Assessment
如果{{name}}步行1又1/2英里到学校，再走3/4英里到朋友家，能算出总路程并判断自己的答案是否合理吗？
If {{name}} walks 1 and 1/2 miles to school and 3/4 of a mile to a friend's house, can they work out the total distance — and check whether their answer makes sense?