Math G2 Workbook: Core Skills and Practice | 数学 G2 练习册：核心技能与训练

📚 Math G2 Workbook: Core Skills and Practice | 数学 G2 练习册：核心技能与训练

This workbook-style article covers the core skills a Grade 2 learner needs in mathematics. It is organised into ten focused sections: place value, addition and subtraction, multiplication, division, fractions, measurement, time and money, geometry, data handling, and problem solving. Work through each section in order, and use the examples to check understanding before attempting your own practice questions.

本文以练习册风格呈现二年级数学所需的核心技能，共分为十个重点小节：位值、加减法、乘法、除法、分数、测量、时间与货币、几何、数据处理和问题解决。请按顺序学习，每节先看例题，再进行自主练习，以检查理解情况。

1. Place Value and Number Sense | 位值与数感

In Grade 2, learners should read, write, and compare three-digit numbers. The number 547 means 5 hundreds + 4 tens + 7 ones. Understanding this helps when adding, subtracting, and rounding.

在二年级，学生应会读、写和比较三位数。547 表示 5 个百 + 4 个十 + 7 个一。理解这一点有助于加减法和估数。

Use a place-value chart to split numbers into hundreds, tens, and ones. For example, 306 has 3 hundreds, 0 tens, and 6 ones. The zero must be written to hold the tens place.

使用位值表把数字拆分为百位、十位和个位。例如，306 有 3 个百、0 个十和 6 个一。0 必须写出，以占据十位。

Compare numbers by looking first at the hundreds digit. 428 is greater than 395 because 4 hundreds > 3 hundreds. Use the symbols <, >, and = correctly.

比较数时先看百位。428 大于 395，因为 4 个百 > 3 个百。正确使用 <、> 和 = 符号。

2. Addition and Subtraction Within 1000 | 1000 以内的加法与减法

Grade 2 addition includes two-digit and three-digit sums with regrouping. Example: 274 + 58 = 332. Add the ones, then the tens, then the hundreds, carrying ten ones as one ten when needed.

二年级加法包括两位数和三位数相加，并涉及进位。例如：274 + 58 = 332。先加个位，再加十位，最后加百位，必要时将 10 个一进为 1 个十。

Subtraction with borrowing is also assessed. Example: 431 – 87 = 344. Borrow one ten from the tens column when the ones digit is too small.

减法也考查借位。例如：431 – 87 = 344。当个位不够减时，从十位借 1 个十。

Mental strategies include using number bonds to 10 and 100, counting on, and using doubles. For 99 + 36, think 100 + 36 – 1 = 135.

心算策略包括使用 10 和 100 的数对、向上计数以及使用双数。计算 99 + 36 时，可看作 100 + 36 – 1 = 135。

3. Multiplication Foundations | 乘法基础

Multiplication is introduced as repeated addition. 3 × 4 means 3 groups of 4, so 4 + 4 + 4 = 12. In Grade 2, learners often practise the 2, 5, and 10 times tables.

乘法以重复加法的形式引入。3 × 4 表示 3 个 4，所以 4 + 4 + 4 = 12。在二年级，学生通常练习 2、5 和 10 的乘法表。

An array shows rows and columns. For 3 × 4, draw 3 rows with 4 circles in each row. The total number is 12. This visual model supports fluency.

阵列图展示行与列。3 × 4 可画 3 行，每行 4 个圆圈，总数为 12。这种直观模型有助于提高乘法熟练度。

Use the multiplication facts: 2 × 6 = 12, 5 × 6 = 30, 10 × 6 = 60. Practise these facts until recall is quick and accurate.

掌握以下乘法事实：2 × 6 = 12、5 × 6 = 30、10 × 6 = 60。反复练习直到能快速、准确地回忆。

4. Division Foundations | 除法基础

Division is sharing into equal groups. 12 ÷ 3 asks how many in each group when 12 objects are shared equally among 3 groups. The answer is 4.

除法是把总数平均分成若干组。12 ÷ 3 表示把 12 个物体平均分给 3 组，每组有 4 个。

Division is the inverse of multiplication. If 3 × 4 = 12, then 12

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