Maths General Knowledge: Core Facts for Classroom PPTs | 数学常识：课堂互动课件核心知识点

📚 Maths General Knowledge: Core Facts for Classroom PPTs | 数学常识：课堂互动课件核心知识点

This article brings together the core mathematical facts, formulas and examples you need to create an engaging Maths GK classroom presentation. Each section is designed as a slide-ready summary for teachers and students.

本文汇集了制作数学常识课堂演示所需的核心数学事实、公式和示例。每一节都设计成适合幻灯片使用的摘要，方便教师和学生使用。

1. Number Systems and Place Value | 数系与位值

Natural numbers (ℕ) start from 1, whole numbers include 0, integers (ℤ) include negative numbers, rational numbers (ℚ) are fractions a/b with b ≠ 0, and irrational numbers cannot be written as exact fractions. Real numbers (ℝ) include all rational and irrational numbers.

自然数（ℕ）从 1 开始，整数（ℤ）包括负整数，有理数（ℚ）是满足 b ≠ 0 的分数 a/b，无理数不能写成精确分数。实数（ℝ）包含所有有理数和无理数。

In the number 4 735, the 7 is in the hundreds place, so it represents 700. Place value shows the value of each digit based on its position.

在数字 4 735 中，7 位于百位，所以表示 700。位值显示了每个数字根据其位置所代表的值。

Decimal places continue to the right: tenths, hundredths, thousandths. For example, 0.456 has 4 tenths, 5 hundredths and 6 thousandths.

小数位从右向左依次是十分位、百分位、千分位。例如 0.456 中有 4 个十分之一、5 个百分之一和 6 个千分之一。

ℝ = ℚ ∪ ℚ′

实数 = 有理数 ∪ 无理数Published by TutorHao | Mathematics Revision Series | aleveler.com

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