Topics
Rational Numbers
- Rational Numbers
- Closure Property of Rational Numbers
- Commutative Property of Rational Numbers
- Associative Property of Rational Numbers
- Distributive Property of Multiplication Over Addition for Rational Numbers
- Identity of Addition and Multiplication of Rational Numbers
- Negative Or Additive Inverse of Rational Numbers
- Concept of Reciprocal or Multiplicative Inverse
- Rational Numbers on a Number Line
- Rational Numbers Between Two Rational Numbers
Linear Equations in One Variable
- Variable of Equation
- Concept of Equation
- Expressions with Variables
- Balancing an Equation
- The Solution of an Equation
- Linear Equation in One Variable
- Solving Equations Which Have Linear Expressions on One Side and Numbers on the Other Side
- Some Applications Solving Equations Which Have Linear Expressions on One Side and Numbers on the Other Side
- Solving Equations Having the Variable on Both Sides
- Some More Applications on the Basis of Solving Equations Having the Variable on Both Sides
- Reducing Equations to Simpler Form
- Equations Reducible to the Linear Form
Understanding Quadrilaterals
- Concept of Curves
- Different Types of Curves - Closed Curve, Open Curve, Simple Curve.
- Concept of Polygons
- Classification of Polygons
- Properties of a Quadrilateral
- Interior Angles of a Polygon
- Exterior Angles of a Polygon and Its Property
- Concept of Quadrilaterals
- Properties of Trapezium
- Properties of Kite
- Properties of a Parallelogram
- Properties of Rhombus
- Property: The Opposite Sides of a Parallelogram Are of Equal Length.
- Property: The Opposite Angles of a Parallelogram Are of Equal Measure.
- Property: The adjacent angles in a parallelogram are supplementary.
- Property: The diagonals of a parallelogram bisect each other. (at the point of their intersection)
- Property: The diagonals of a rhombus are perpendicular bisectors of one another.
- Property: The Diagonals of a Rectangle Are of Equal Length.
- Properties of Rectangle
- Properties of a Square
- Property: The diagonals of a square are perpendicular bisectors of each other.
Practical Geometry
- Introduction to Geometric Tool
- Constructing a Quadrilateral When the Lengths of Four Sides and a Diagonal Are Given
- Constructing a Quadrilateral When Two Diagonals and Three Sides Are Given
- Constructing a Quadrilateral When Two Adjacent Sides and Three Angles Are Known
- Constructing a Quadrilateral When Three Sides and Two Included Angles Are Given
- Some Special Cases
Data Handling
- Concept of Data Handling
- Interpretation of a Pictograph
- Interpretation of Bar Graphs
- Drawing a Bar Graph
- Interpretation of a Double Bar Graph
- Drawing a Double Bar Graph
- Organisation of Data
- Frequency Distribution Table
- Graphical Representation of Data as Histograms
- Concept of Pie Graph (Or a Circle-graph)
- Interpretation of Pie Diagram
- Chance and Probability - Chance
- Basic Ideas of Probability
Squares and Square Roots
- Concept of Square Number
- Properties of Square Numbers
- Some More Interesting Patterns of Square Number
- Finding the Square of a Number
- Concept of Square Roots
- Finding Square Root Through Repeated Subtraction
- Finding Square Root Through Prime Factorisation
- Finding Square Root by Division Method
- Square Root of Decimal Numbers
- Estimating Square Root
Cubes and Cube Roots
Comparing Quantities
- Concept of Ratio
- Basic Concept of Percentage
- Increase Or Decrease as Percent
- Concept of Discount
- Estimation in Percentages
- Basic Concepts of Profit and Loss
- Sales Tax, Value Added Tax, and Good and Services Tax
- Calculation of Interest
- Concept of Compound Interest
- Deducing a Formula for Compound Interest
- Rate Compounded Annually Or Half Yearly (Semi Annually)
- Applications of Compound Interest Formula
Algebraic Expressions and Identities
- Algebraic Expressions
- Terms, Factors and Coefficients of Expression
- Types of Algebraic Expressions as Monomials, Binomials, Trinomials, and Polynomials
- Like and Unlike Terms
- Addition of Algebraic Expressions
- Subtraction of Algebraic Expressions
- Multiplication of Algebraic Expressions
- Multiplying Monomial by Monomials
- Multiplying a Monomial by a Binomial
- Multiplying a Monomial by a Trinomial
- Multiplying a Binomial by a Binomial
- Multiplying a Binomial by a Trinomial
- Concept of Identity
- Expansion of (a + b)2 = a2 + 2ab + b2
- Expansion of (a - b)2 = a2 - 2ab + b2
- Expansion of (a + b)(a - b) = a2-b2
- Expansion of (x + a)(x + b)
Mensuration
Visualizing Solid Shapes
Exponents and Powers
Direct and Inverse Proportions
Factorization
- Factors and Multiples
- Factorising Algebraic Expressions
- Factorisation by Taking Out Common Factors
- Factorisation by Regrouping Terms
- Factorisation Using Identities
- Factors of the Form (x + a)(x + b)
- Dividing a Monomial by a Monomial
- Dividing a Polynomial by a Monomial
- Dividing a Polynomial by a Polynomial
- Concept of Find the Error
Introduction to Graphs
- Concept of Bar Graph
- Interpretation of Bar Graphs
- Drawing a Bar Graph
- Concept of Double Bar Graph
- Interpretation of a Double Bar Graph
- Drawing a Double Bar Graph
- Concept of Pie Graph (Or a Circle-graph)
- Graphical Representation of Data as Histograms
- Concept of a Line Graph
- Linear Graphs
- Some Application of Linear Graphs
Playing with Numbers
Notes
Solving an Equation:
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A balanced equation is like a weighing balance with equal weights in the two pans.
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An equation is like a weighing balance with equal weights on both its pans, in which case the arm of the balance is exactly horizontal. If we add the same weights to both the pans, the arm remains horizontal. Similarly, if we remove the same weights from both the pans, the arm remains horizontal. On the other hand, if we add different weights to the pans or remove different weights from them, the balance is tilted; that is, the arm of the balance does not remain horizontal.
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Thus if we fail to do the same mathematical operation with the same number on both sides of an equality, the equality may not hold.
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The value of the variable which balances or satisfies the equation is called the ‘solution’ to the equation.
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To solve an equation is to find the value of the variable in the equation or to find the solution to the equation.
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Example, The solution to the equation ‘x + 190 = 300’ is 110.
Mathematical Operations on Expressions:
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If the same operation is carried out on both sides of an equation every time, the equation remains balanced. When any of the following operations are carried out on an equation, the equation remains balanced.
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Adding the same number to both sides:
Let us now add 8 to both sides; as a result
LHS = 8 – 3 + 8 = 5 + 8 = 13
RHS = 4 + 1 + 8 = 5 + 8 = 13.
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Subtracting the same number from both sides:
Let us now subtract 3 from both the sides; as a result,
LHS = 8 – 3 – 3 = 5 – 3 = 2
RHS = 4 + 1 – 3 = 5 – 3 = 2.
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Multiplying both sides by the same number:
Let us multiply both the sides of the equality by 3, we get
LHS = 3 × (8 – 3) = 3 × 5 = 15,
RHS = 3 × (4 + 1) = 3 × 5 = 15.
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Dividing both sides by the same non-zero number:
Let us now divide both sides of the equality by 2.
LHS = (8 – 3) ÷ 2 = 5 ÷ 2 = `5/2`
RHS = (4 + 1) ÷ 2 = 5 ÷ 2 = `5/2`.
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Exchanging the two sides:
Let us now exchange the following two sides.
5 m + 7 = 17
5 m = 17 – 7
5 m = 10
m = `10/5`
m = 2.
If the same operation is carried out on both sides of an equation every time, the equation remains balanced. When any of the following operations are carried out on an equation, the equation remains balanced.
Adding the same number to both sides:
Let us now add 8 to both sides; as a result
LHS = 8 – 3 + 8 = 5 + 8 = 13
RHS = 4 + 1 + 8 = 5 + 8 = 13.
Subtracting the same number from both sides:
Let us now subtract 3 from both the sides; as a result,
LHS = 8 – 3 – 3 = 5 – 3 = 2
RHS = 4 + 1 – 3 = 5 – 3 = 2.
Multiplying both sides by the same number:
Let us multiply both the sides of the equality by 3, we get
LHS = 3 × (8 – 3) = 3 × 5 = 15,
RHS = 3 × (4 + 1) = 3 × 5 = 15.
Dividing both sides by the same non-zero number:
Let us now divide both sides of the equality by 2.
LHS = (8 – 3) ÷ 2 = 5 ÷ 2 = `5/2`
RHS = (4 + 1) ÷ 2 = 5 ÷ 2 = `5/2`.
Exchanging the two sides:
Let us now exchange the following two sides.
5 m + 7 = 17
5 m = 17 – 7
5 m = 10
m = `10/5`
m = 2.
Shaalaa.com | Solving Equations & Transposition Method
Series: Solving Equations & Transposition Method
Related QuestionsVIEW ALL [57]
Rewrite the following using a letter.
The difference obtained by subtracting 11 from another number.
Given below are some equations and the values of the variables. Are these values the solutions to those equations?
| No | Equation | Value of the variable | Solution (Yes/No) |
| 1 | y - 3 = 11 | y = 3 | No |
| 2 | 17 = n + 7 | n = 10 | |
| 3 | 30 = 5x | x = 6 | |
| 4 | `"m"/2 = 14` | m = 7 |
