Fractions Basics
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Questions and Answers

What is the simplified form of the fraction 6/8?

  • 2/3
  • 3/4
  • 3/8
  • 1/2 (correct)

0.5 is a decimal representation of the fraction 1/2.

True (A)

What is the percentage representation of the fraction 3/4?

75%

A ______________ is a location in space, represented by coordinates (x, y).

<p>point</p> Signup and view all the answers

What is the equation to find the perimeter of a rectangle?

<p>P = 2(l + w) (C)</p> Signup and view all the answers

In algebra, variables are numbers without unknown values.

<p>False (B)</p> Signup and view all the answers

Match the following types of angles with their descriptions:

<p>Acute = Less than 90° Right = 90° Obtuse = Greater than 90°</p> Signup and view all the answers

Study Notes

Fractions

  • A fraction represents a part of a whole
  • Consists of a numerator (top number) and a denominator (bottom number)
  • Examples: 1/2, 3/4, 2/3
  • Equivalent fractions: fractions with the same value, e.g. 1/2 = 2/4 = 3/6
  • Simplifying fractions: dividing both numerator and denominator by their greatest common divisor (GCD)
  • Operations with fractions:
    • Addition: add numerators, keep denominator the same
    • Subtraction: subtract numerators, keep denominator the same
    • Multiplication: multiply numerators and denominators
    • Division: invert and multiply

Decimals

  • A decimal is a way to represent a fraction with a denominator of 10, 100, 1000, etc.
  • Examples: 0.5, 0.25, 3.14
  • Converting fractions to decimals: divide numerator by denominator
  • Operations with decimals:
    • Addition and subtraction: same as with whole numbers
    • Multiplication: same as with whole numbers
    • Division: same as with whole numbers, but be careful with place value

Percentages

  • A percentage is a way to represent a fraction with a denominator of 100
  • Examples: 25%, 50%, 75%
  • Converting fractions to percentages: divide numerator by denominator, multiply by 100
  • Converting decimals to percentages: multiply by 100
  • Operations with percentages:
    • Increase: multiply by (1 + percentage)
    • Decrease: multiply by (1 - percentage)

Geometry

  • Points: locations in space, represented by coordinates (x, y)
  • Lines: sets of points extending infinitely in two directions
  • Line segments: parts of lines with a fixed length
  • Angles: formed by two lines or line segments
  • Types of angles:
    • Acute: less than 90°
    • Right: 90°
    • Obtuse: greater than 90°
  • Basic geometry formulas:
    • Perimeter: distance around a shape
    • Area: size of a shape
    • Volume: amount of space inside a 3D shape

Basic Algebra

  • Variables: letters or symbols representing unknown values
  • Constants: numbers without variables
  • Expressions: combinations of variables, constants, and operations
  • Equations: statements with equal values, e.g. 2x + 3 = 5
  • Solving equations:
    • Addition and subtraction: inverse operations
    • Multiplication and division: inverse operations
  • Basic algebra formulas:
    • Linear equation: ax + b = c
    • Quadratic equation: ax^2 + bx + c = 0

分数

  • 分数表示一个整体的一部分
  • 由分子(上面的数字)和分母(下面的数字)组成
  • 例如:1/2、3/4、2/3
  • 等值分数:具有相同值的分数,例如 1/2 = 2/4 = 3/6
  • 简化分数:将分子和分母同时除以它们的最大公约数(GCD)
  • 分数运算:
    • 加法:加分子,保持分母不变
    • 减法:减分子,保持分母不变
    • 乘法:相乘分子和分母
    • 除法:倒数然后相乘

小数

  • 小数是以10、100、1000等为分母的分数的表示方式
  • 例如:0.5、0.25、3.14
  • 将分数转换为小数:将分子除以分母
  • 小数运算:
    • 加法和减法:与整数运算相同
    • 乘法:与整数运算相同
    • 除法:与整数运算相同,但要注意小数点的位置

百分数

  • 百分数是以100为分母的分数的表示方式
  • 例如:25%、50%、75%
  • 将分数转换为百分数:将分子除以分母,乘以100
  • 将小数转换为百分数:乘以100
  • 百分数运算:
    • 增加:乘以(1 + 百分数)
    • 降低:乘以(1 - 百分数)

几何

  • 点:空间中的位置,用坐标(x、y)表示
  • 线:无限延伸的点集
  • 线段:有限长度的线的一部分
  • 角:由两条线或线段形成
  • 角的类型:
    • 锐角:小于90°
    • 直角:90°
    • 钝角:大于90°
  • 基本几何公式:
    • 周长:形状周围的距离
    • 面积:形状的大小
    • 体积:三维形状内部的空间

初等代数

  • 变量:表示未知数值的字母或符号
  • 常数:不含变量的数字
  • 表达式:变量、常数和运算的组合
  • 方程:具有相同值的语句,例如 2x + 3 = 5
  • 解方程:
    • 加法和减法:逆运算
    • 乘法和除法:逆运算
  • 基本代数公式:
    • 线性方程:ax + b = c
    • 二次方程:ax^2 + bx + c = 0

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