Grade 3 Maths Revision Slides | 三年级数学复习课件核心要点

📚 Grade 3 Maths Revision Slides | 三年级数学复习课件核心要点

This revision guide condenses the key ideas shown in a typical Grade 3 mathematics slide deck. It is designed for students, parents and teachers who want a clear, bilingual recap of the most important skills.

本复习指南浓缩了三年级数学课件PPT中的核心内容，适合学生、家长和教师进行清晰的双语回顾与巩固。

1. Understanding Place Value to 1000 | 理解千以内数的位值

In a Grade 3 slide deck, the first key idea is that every digit has a value based on its place. The places up to 1000 are ones, tens and hundreds.

三年级课件首先强调，每个数字的大小取决于它所在的数位。千以内的数位包括个位、十位和百位。

For example, 364 means 3 hundreds, 6 tens and 4 ones. We can write this in expanded form.

例如，364 表示 3 个百、6 个十和 4 个一。我们可以用展开式来表示。

364 = 300 + 60 + 4

Comparing numbers is easier when we line up the digits by place value. If the hundreds are different, the number with the greater hundreds digit is larger.

比较数的大小时，按数位对齐会更容易。如果百位不同，百位数字较大的那个数就更大。

Rounding to the nearest ten or hundred is another skill shown in many G3 slides.

许多三年级课件还会展示四舍五入到十位或百位的技能。

47 ≈ 50 (to the nearest ten)

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2. Addition and Subtraction Strategies | 加法与减法策略

Column addition with regrouping is a central skill. Always start from the ones column and carry extra tens or hundreds to the next column.

进位加法是核心技能。始终从个位开始计算，并把多出的十位或百位进到下一列。

456 + 278 = 734

Column subtraction often requires borrowing from a larger place value. Slide decks remind students to check by adding the answer to the smaller number.

退位减法通常需要从更大的数位借位。课件提醒学生用答案加上较小的数来验算。

604 − 287 = 317

Mental strategies include making ten, using doubles and thinking of fact families.

心算策略包括凑十法、加倍法以及利用加减法互逆关系。

• Making ten: 8 + 6 = 8 + 2 + 4 = 14 | 凑十法：8 + 6 = 8 + 2 + 4 = 14
• Fact family: 7 + 5 = 12, so 12 − 5 = 7 | 加减互逆：7 + 5 = 12，所以 12 − 5 = 7

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3. Multiplication Meaning and Tables | 乘法的意义与乘法表

ition and through arrays. A slide deck often shows 4 rows of 5 dots to explain 4 × 5 = 20.

乘法通常通过重复相加和点阵图引入。课件常展示4行5列的点阵来解释 4 × 5 = 20。

4 × 5 = 20

Learners should know the 2, 3, 4, 5 and 10 times tables fluently. Skip counting helps build this fluency.

学生应熟练掌握 2、3、4、5 和 10 的乘法表。跳数计数有助于培养这种熟练度。

The commutative property is shown by turning an array around: 3 × 4 is the same as 4 × 3.

通过旋转点阵图可以展示乘法交换律：3 × 4 等于 4 × 3。

3 × 4 = 4 × 3 = 12

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4. Division as Sharing and Grouping | 除法：平均分与分组

Division can mean sharing equally or grouping into equal sets. The symbol ÷ means 'divided by'.

除法可以表示平均分，也可以表示按相同数量分组。符号 ÷ 表示"除以"。

24 ÷ 6 = 4

ision is often connected to multiplication. If 6 × 4 = 24, then 24 ÷ 6 = 4 and 24 ÷ 4 = 6.

课件通常会将除法与乘法联系起来。如果 6 × 4 = 24，那么 24 ÷ 6 = 4，且 24 ÷ 4 = 6。

Remainders appear when amounts cannot be divided equally, such as 14 ÷ 3 = 4 remainder 2.

当数量无法被平均分时会出现余数，例如 14 ÷ 3 = 4 余 2。

14 ÷ 3 = 4 r 2

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5. Fractions of Shapes and Sets | 图形与集合中的分数

A fraction shows equal parts of a whole. The denominator tells how many equal parts there are, and the numerator tells how many parts we take.

分数表示一个整体的等份。分母表示整体被分成多少等份，分子表示取了多少份。

¾ means 3 parts out of 4 equal parts

G3 slides often ask for fractions of shapes and fractions of sets. Shading ½ of a rectangle or finding ¼ of 12 counters are common tasks.

三年级课件常要求找出图形或集合的分数，例如给矩形的 ½ 涂色，或求 12 个计数器的 ¼。

¼ of 12 = 3

Simple equivalent fractions such as ½ = 2/4 can be shown with fraction strips.

简单的等值分数，如 ½ = 2/4，可以用分数条展示。

½ = 2/4

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6. Measurement: Length, Mass and Capacity | 测量：长度、质量与容量

Measurement in Grade 3 covers length, mass and capacity. Learners choose appropriate units and read simple scales.

三年级的测量内容涵盖长度、质量和容量。学生要学会选择合适的单位并读取简单的刻度

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