📚 Year 7 Core Homework Answers: Key Skills Explained | 七年级核心作业答案：关键技能解析
Year 7 core homework often brings together numeracy, literacy and scientific thinking. This guide explains how to approach common answer types and shows worked examples so you can check your reasoning, not just copy a result.
七年级核心作业通常综合了计算能力、读写能力和科学思维。本指南说明如何处理常见题型，并给出示例解答，帮助你检验自己的推理过程，而不仅仅是抄写结果。
1. Understanding the Homework Brief | 理解作业要求
Before writing any answer, read the question twice and underline the command word, such as 'explain', 'calculate' or 'compare'. This tells you what type of response is expected.
在写任何答案之前，先读两遍题目，并在指令词下划线，例如 "解释" "计算" 或 "比较"。这会告诉你需要给出什么类型的回答。
For example, 'Calculate 36 + 27' only needs a number, while 'Explain how you know 36 + 27 = 63' needs a sentence about place value and carrying.
例如，"计算 36 + 27" 只要求给出一个数字，而 "解释你怎么知道 36 + 27 = 63" 则需要写出关于位值和进位的一句话。
Always check how many marks are available. In most Year 7 tasks, one mark means one clear step, so a two-mark question usually needs working as well as a final answer.
一定要看题目有多少分。在大多数七年级作业中，1 分代表一个清晰步骤，所以 2 分的题目通常既需要过程，也需要最终答案。
2. Place Value and Number Properties | 位值与数字性质
Place value means that each digit in a number has a value based on its position. In 4,307 the 4 is thousands, the 3 is hundreds, the 0 is tens and the 7 is ones.
位值是指一个数字中每个数字因其位置而具有不同的值。在 4,307 中，4 是千位，3 是百位，0 是十位，7 是个位。
To order negative numbers, remember that -7 is less than -2 because it is further left on the number line.
要比较负数的大小，记住 -7 小于 -2，因为它在数轴上更靠左。
Working example: Round 4,762 to the nearest hundred. Look at the tens digit, 6, so round up to 4,800.
示例：将 4,762 四舍五入到最近的百位。看十位数字 6，所以向上进位到 4,800。
4,762 → 4,800
3. Fractions, Decimals and Percentages | 分数、小数与百分比
, decimal and percentage can represent the same part of a whole. For example, ½ = 0.5 = 50%.
分数、小数和百分比可以表示同一个整体的一部分。例如，½ = 0.5 = 50%。
The lowest common multiple of 4 and 3 is 12, so ¼ = 3/12 and ⅓ = 4/12. Adding gives 7/12.
要计算 ¼ + ⅓ 这样的分数加法，首先要找到公分母。4 和 3 的最小公倍数是 12，因此 ¼ = 3/12，⅓ = 4/12。相加得到 7/12。
¼ + ⅓ = 3/12 + 4/12 = 7/12
the numerator by the denominator and multiply by 100. For ⅝, 5 ÷ 8 = 0.625, so it is 62.5%.
要把分数转换成百分比，用分子除以分母，再乘以 100。对于 ⅝，5 ÷ 8 = 0.625，所以是 62.5%。
4. Introduction to Algebra | 代数入门
In algebra, letters stand for unknown numbers. The expression 3a + 2 means 'three times a, then add two'.
在代数中，字母代表未知数。表达式 3a + 2 的意思是 "a 的 3 倍再加 2"。
To solve x + 7 = 15, subtract 7 from both sides: x = 15 - 7, so x = 8.
要解方程 x + 7 = 15，两边同时减去 7：x = 15 - 7，所以 x = 8。
x + 7 = 15 → x = 8
ver you do to one side, do to the other. For 4x = 20, divide both sides by 4 to get x = 5.
始终保持等式平衡。你对一边做什么，对另一边也要做同样的运算。对于 4x = 20，两边同时除以 4，得到 x = 5。
5. Grammar and Sentence Structure | 语法与句子结构
A complete sentence needs a subject and a verb. 'The dog barked' is complete, but 'because the dog barked' is a fragment.
一个完整的句子需要主语和谓语。"The dog barked" 是完整的，但 "because the dog barked" 是一个不完整的片段。
Use a comma before a coordinating conjunction such as 'and', 'but' or 'so' when it joins two independent clauses: 'I finished my homework, and I packed my bag.'
当 and、but、so 等并列连词连接两个独立分句时，要在连词前加逗号："I finished my homework, and I packed my bag."
Apostrophes show possession or contraction. 'The teacher's book' means one teacher; 'the teachers' room' means more than one teacher.
撇号表示所有格或缩写。"The teacher's book" 表示一位老师；"the teachers' room" 表示多位老师的房间。
6. Reading Comprehension Strategies | 阅读理解策略
When answering a comprehension question, find key words in the question and scan the text for them. Then read the sentence before and after to understand context.
回答阅读理解题时，先找出题目中的关键词，再到文章中快速定位。然后读关键词前后的句子以理解上下文。
Use PEE for longer answers: Point, Evidence, Explanation. State your point, quote a short phrase from the text, and explain what it shows.
较长的答案可以使用 PEE 结构：观点、证据、解释。先陈述观点，再引用文中的简短语句，最后解释它说明了什么。
If asked 'What impression do you get of the character?', avoid one-word answers. Write 'The character seems determined because the text says she tried again after failing' to show inference.
如果题目问 "你对这个人物有什么印象？"，不要只写一个词。要写出 "这个人物似乎很坚定，因为文中说她在失败后又尝试了一次"，以展示推断能力。
7. Scientific Method Basics | 科学方法基础
A hypothesis is a testable prediction, often written as 'If ... then ...'. For example, 'If the temperature increases, then the sugar will dissolve faster.'
假设是一个可检验的预测，通常写成 "如果……那么……"。例如，"如果温度升高，那么糖会溶解得更快。"
The independent variable is the one you change, the dependent variable is the one you measure, and control variables are kept the same.
自变量是你改变的变量，因变量是你测量的变量，控制变量则是保持不变的条件。
Record results in a table with clear headings and units, such as 'Time (s)' and 'Temperature (°C)'. Then plot a line graph if both variables are continuous.
用清晰的表头记录结果，并标明单位，例如 "时间（s）" 和 "温度（°C）"。如果两个变量都是连续量，可以绘制折线图。
8. Cells and Living Things | 细胞与生物
Plant cells have a cell wall, chloroplasts and a large permanent vacuole; animal cells do not. Both have a nucleus, cytoplasm and cell membrane.
植物细胞有细胞壁、叶绿体和大的永久液泡；动物细胞没有。两者都有细胞核、细胞质和细胞膜。
Diffusion is the movement of particles from a region of higher concentration to a region of lower concentration. It is how oxygen enters cells.
扩散是粒子从高浓度区域向低浓度区域的运动。氧气就是这样进入细胞的。
When labelling a microscope diagram, include the eyepiece, objective lens, stage, light source and focusing knobs. Remember to start with the lowest power objective.
在标注显微镜结构图时，要包括目镜、物镜、载物台、光源和调焦旋钮。记住要从最低倍物镜开始观察。
9. Organising Your Answers Clearly | 清晰组织答案
ulations. For 28 + 47, write the numbers above each other and carry the ten: 28 + 47 = 75.
计算时把过程竖着写清楚。例如 28 + 47，上下对齐写出数字并进位：28 + 47 = 75。
Use bullet points only when the question asks for a list. In science, a list of safety rules can be written as short bullet points with no full sentences.
只有当题目要求列出要点时才使用项目符号。在科学中，安全规则可以用简短的项目符号列出，不必写成完整句子。
Underline or box your final answer so the marker can see it quickly, but do not colour over your working.
给最终答案画下划线或用方框框起来，方便批改者快速看到，但不要把过程涂掉。
10. Checking and Self-Correction | 检查与自我纠正
by reversing the operation. If 72 ÷ 8 = 9, then multiply 9 × 8 to see if it returns to 72.
通过逆运算检查答案。如果 72 ÷ 8 = 9，那么计算 9 × 8，看是否回到 72。
Read written answers aloud to catch missing words or tense errors. Look for common homophones such as there/their/they're and too/to/two.
大声朗读书面答案，以发现漏词或时态错误。注意常见同音异义词，例如 there/their/they're 和 too/to/two。
Before submitting, tick off each part of the question. If it has three bullet points, make sure your answer covers all three.
提交前，逐项勾选题目要求。如果题目有三个小点，确保你的答案覆盖全部三点。
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