📚 Year 7 WJEC Maths: Key Tips for Experimental / Practical Assessments | Year 7 WJEC 数学：实验/实践考核要点
In Year 7 WJEC Maths, practical assessments are your chance to show how you can use numbers, measures and data to solve real-life problems. Whether you are investigating the best value chocolate bar, conducting a survey on favourite sports, or measuring the classroom to plan new furniture, these tasks test your ability to think, plan, measure, calculate and explain. This guide walks you through the key skills you need to succeed, from understanding the brief to presenting your final work.
在WJEC七年级数学中，实践考核是你展示如何运用数字、测量和数据解决现实问题的机会。无论是调查哪种巧克力棒性价比最高、对最喜爱的运动进行问卷调查，还是测量教室来规划新家具，这些任务都考验你思考、计划、测量、计算和解释的能力。本指南将带你梳理成功所需的关键技能，从理解任务要求到展示最终作品。
1. Read and Unpack the Brief | 仔细阅读并分析任务要求
Before touching any equipment, read the assessment sheet at least twice. Highlight key instruction words like ‘measure’, ‘compare’, ‘estimate’, ‘survey’ or ‘justify’. Make sure you know what you are being asked to produce, such as a report, a poster, a set of graphs or an oral presentation.
在接触任何器材之前，至少阅读考核说明两遍。标出关键指令词，如“测量”、“比较”、“估计”、“调查”或“证明”。确保你知道需要提交什么成果，例如一份报告、一张海报、一组图表或口头展示。
Break the task into smaller questions. For example, if the task says ‘Plan a party for 30 people with a budget of £50’, you can split it into: a) Research item prices, b) Calculate quantities, c) Compare shop offers, d) Present a budget table and e) Explain your choices. This stops you from feeling overwhelmed.
把任务拆解成小问题。比如，任务要求“用50英镑预算为30人策划派对”，你可以拆分为：a) 调查物品价格，b) 计算数量，c) 比较商店优惠，d) 呈现预算表，e) 解释你的选择。这样就不会感到无从下手。
2. Make a Clear Plan | 制定清晰计划
Plan what data you need and how you will collect it. Decide whether you will measure lengths with a ruler, weigh items with scales, or gather opinions through a tally chart. Write a step-by-step method so you don’t forget important stages.
计划你需要哪些数据以及如何收集。决定你是用尺子量长度、用秤称重量，还是用划记表收集意见。写下分步方法，以免遗漏重要阶段。
Always include a list of equipment. Even simple items like a stopwatch, trundle wheel or graph paper should be on your list. This shows the examiner you are organised and thinking like a mathematician.
始终列出所需器材清单。即使像秒表、测距滚轮或坐标纸这样的简单物品也要列上。这向考官展示你有条理，并像数学家一样思考。
Good experiment plan: 1) Write hypothesis 2) Choose method 3) List equipment 4) Collect data 5) Calculate results 6) Draw conclusion
好的实验计划：1) 写下假设 2) 选择方法 3) 列出器材 4) 收集数据 5) 计算结果 6) 得出结论
3. Measure with Accuracy and Precision | 准确而精确地测量
When measuring length, weight, time or capacity, always read the scale at eye level. For a ruler, make sure the zero mark lines up exactly with the edge of the object, and read the measurement to the nearest millimetre (mm). Avoid rounding too early – record the exact reading.
测量长度、重量、时间或容量时，始终在视线水平位置读取刻度。使用尺子时，确保零刻度线对准物体边缘，并读取到最接近的毫米。避免过早四舍五入——记录精确读数。
Take each measurement at least twice to check for errors. If two readings are very different, measure a third time and use the average. Remember that no measurement is perfect; always note the units (cm, m, g, kg, seconds) clearly.
每个测量至少进行两次，以检查误差。如果两次读数差异很大，就测量第三次并使用平均值。记住，没有完美的测量；始终清楚地标明单位（厘米、米、克、千克、秒）。
Average = (Trial 1 + Trial 2 + Trial 3) ÷ 3
平均值 = (试验1 + 试验2 + 试验3) ÷ 3
4. Collect Data Systematically | 系统地收集数据
Use a tally chart with categories to record observations neatly. For example, if you are surveying how pupils travel to school, list ‘Walk’, ‘Bus’, ‘Car’, ‘Bike’ in the first column, and draw tally marks in the second. Group tallies in fives (~~IIII~~) so you can count them quickly later.
使用带有分类的划记表，整洁地记录观察结果。例如，如果你在调查学生的上学方式，在左列列出“步行”、“公交”、“私家车”、“自行车”，右列画划记符号。以五个为一组（~~IIII~~）标记，这样之后能快速计数。
When investigating through an experiment, design a data table before you start. The table should have clear column headings with units, and rows for each trial. Leave space for calculated values like totals or averages.
通过实验进行调查时，在开始前设计数据表格。表格应具备清晰的列标题和单位，并为每次试验留出行。还要留出空间填写计算值，如总计或平均值。
5. Organise Calculations Logically | 有逻辑地组织计算
Show all your working step by step. Even if you use a calculator, write down the numbers you entered and the result. This is vital because in practical assessments the process is often worth more marks than the final answer alone.
一步步展示所有运算过程。即使使用计算器，也要写下你输入的数字和得到的结果。这至关重要，因为在实践考核中，过程往往比最终答案更有分值。
When working with money, always use two decimal places for pounds (£) and be careful with rounding. For area or perimeter, write the formula first, substitute the numbers, then calculate. Use proper units² for area (e.g. cm², m²).
涉及金钱时，英镑始终保留两位小数，并留意四舍五入。计算面积或周长时，先写公式，代入数值，再计算。面积使用相应的平方单位（如 cm², m²）。
Perimeter of rectangle = 2(length + width)
长方形周长 = 2 × (长 + 宽)
Area of rectangle = length × width
长方形面积 = 长 × 宽
6. Pick the Right Graph or Chart | 选择合适的图表
Choose your chart based on the type of data you have. Use bar charts for comparing categories (like favourite flavours), line graphs for showing change over time (like temperature during a day), and pie charts to show proportions of a whole. Always label axes and give the chart a title.
根据数据类型选择图表。用条形图比较类别（比如最喜爱的口味），用折线图显示随时间的变化（比如一天的温度），用饼图展示整体中的比例。始终给坐标轴加标签，并为图表起一个标题。
Draw bar charts with equal width bars, spaced evenly. The vertical axis must start at zero and have a consistent scale. If you draw a line graph, plot points carefully with a small cross ‘×’, then join them with a ruler.
绘制条形图时，条宽相等且间距均匀。纵轴必须从零开始，并具有一致的刻度。如果画折线图，用小叉号“×”精确描点，然后用尺子将它们连接起来。
7. Interpret Data and Spot Patterns | 解读数据并发现规律
Once your chart is finished, don’t just move on – study it. Look for the highest and lowest values, any obvious trends, and surprising results. Write statements like ‘The most common way to travel is by bus, chosen by 18 out of 30 pupils.’
图表完成后，不要直接跳过——仔细研究它。寻找最高值和最低值、明显的趋势和令人惊讶的结果。写下诸如“最常见的上学方式是坐公交，30名同学中有18人选择”这样的陈述。
Calculate the mean, median, mode and range where appropriate. These single numbers summarise your data and help you compare groups. For example, ‘The mean time taken to run 100 m was 14.6 seconds, with a range of 3.2 seconds, showing fairly consistent performance.’
在合适的时候计算平均数、中位数、众数和极差。这些单独的数字能概括你的数据，并帮助你比较各数据集。比如，“跑100米的平均时间是14.6秒，极差为3.2秒，显示成绩相当稳定。”
Mean = sum of all values ÷ number of values
平均数 = 所有数值之和 ÷ 数值个数
Range = largest value − smallest value
极差 = 最大值 − 最小值
8. Link Back to the Original Problem | 回扣原问题
Always refer back to the question or hypothesis you started with. If you set out to find the best value fruit juice by comparing pence per millilitre, state clearly which one is best value and why. Use your calculations as evidence.
始终回顾你最初的问题或假设。如果你最初的目标是通过比较每毫升单价找到最划算的果汁，那么清楚地说明哪一种最划算，并解释原因。用你的计算作为证据。
If your results don’t match what you expected, that’s fine – just explain what might have caused the difference. For example, ‘The 500 ml bottle appeared cheaper, but the 1 litre carton was actually better value per 100 ml. This happened because special offers affected the unit price.’
如果你的结果与预期不符，那也没问题——只需解释可能的原因。例如，“500毫升瓶看起来更便宜，但事实上1升装每100毫升更划算。这是因为特价优惠影响了单位价格。”
9. Evaluate Your Method | 评价你的方法
Think about what worked well and what you could improve next time. Did you take enough measurements? Were there any sources of error, like a misaligned ruler or a wobbly surface? Acknowledging limitations shows higher-level thinking.
思考哪些地方做得好，以及哪些地方下一次可以改进。你是否采取了足够多的测量？是否存在误差来源，比如尺子没有对准或桌面不平整？承认局限性体现了更高层次的思考能力。
Suggest a specific improvement. Instead of saying ‘I would be more careful’, say ‘I would use a digital stopwatch instead of the class clock to measure reaction times, reducing human error.’ This makes your evaluation credible.
提出具体的改进方案。不要说“我会更加小心”，而要说“我会使用电子秒表而不是教室时钟来测量反应时间，以减少人为误差。”这让你的评估可信。
10. Present Your Work Neatly | 整洁地展示作品
Whether you are making a poster, a booklet or a slide show, use clear headings, draw borders around tables, and write legibly. Charts should be drawn in pencil first, then traced with colour. Use a ruler for straight lines and equal spacing.
无论你在做海报、小册子或者幻灯片，请使用清晰的标题，给表格画上边框，书写工整。图表应先用铅笔绘制，再用彩笔描摹。用尺子画直线并保持等距。
Number your pages or sections. If you are using a computer, choose readable fonts and avoid cluttered animations. The examiner must be able to follow your thought process effortlessly. A well-presented project immediately earns respect.
给你的页面或章节编号。如果使用电脑，请选择易读的字体，避免杂乱的动画。考官必须能毫不费力地跟随你的思考过程。一份展示精良的项目立即赢得尊重。
11. Double-Check Before Handing In | 提交前仔细检查
Go through a final checklist: have you labelled axes and given a title to every graph? Are all measurements in the correct units? Have you written a conclusion that matches the data? Did you spellcheck and correct any obvious mistakes?
按最终检查清单逐项核对：你是否给每个图表标注了坐标轴和标题？所有度量的单位是否正确？你写的结论是否与数据相符？你是否检查了拼写并改正了明显错误？
Ask a friend or family member to read your report – if they can’t understand a graph or a calculation, you need to add an explanation. A fresh pair of eyes often catches things you have overlooked, such as missing percentage signs or confusing table columns.
请一位朋友或家人阅读你的报告——如果他们看不明白某个图表或计算，你就需要补充解释。新的眼光常常能发现你忽略的东西，比如遗漏了百分号，或者表格列令人困惑。
Published by TutorHao | Mathematics Revision Series | aleveler.com
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