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 Reciprocals or Multiplicative Inverses
- Rational Numbers on a Number Line
- Rational Numbers Between Two Rational Numbers
- Multiples and Common Multiples
Linear Equations in One Variable
- Constants and Variables in Mathematics
- Equation in Mathematics
- Expressions with Variables
- Word Problems on Linear Equations
- 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 Linear Equations
Understanding Quadrilaterals
- Concept of Curves
- Different Types of Curves - Closed Curve, Open Curve, Simple Curve.
- Basic Concept of Polygons
- Classification of Polygons
- Properties of Quadrilateral
- Sum of Interior Angles of a Polygon
- Sum of Exterior Angles of a Polygon
- 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.
Data Handling
Practical Geometry
- 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
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
- Ratio
- Increase Or Decrease as Percent
- Concept of Discount
- Estimation in Percentages
- Basic Concepts of Profit and Loss
- 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
- Classification of Terms in Algebra
- 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
Exponents and Powers
Visualizing Solid Shapes
Direct and Inverse Proportions
Factorization
- Factors and Common Factors
- 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
Playing with Numbers
- Independent variable
- Dependent variable
- Quantity and Cost
- Principal and Simple Interest
- Time and Distance
Definition
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Independent Variable: Anything which is completely independent and its quantity do not depend on any other factor then it is called Independent Variable.
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Dependent Variable: Anything which increases or decreases with the quantity of any other factor or it is dependent on any other factor then it is called Dependent Variable.
Notes
Some Applications:
-
Independent Variable: Anything which is completely independent and its quantity do not depend on any other factor then it is called Independent Variable.
-
Dependent Variable: Anything which increases or decreases with the quantity of any other factor or it is dependent on any other factor then it is called a Dependent Variable.
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For example, If more electricity is consumed, the bill is bound to be high. The amount of electric bill depends on the quantity of electricity used. We say that the quantity of electricity is an independent variable (or sometimes control variable) and the amount of electric bill is the dependent variable.
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The relation between the dependent variable and the independent variable is shown through a graph.
For example,
The following table gives the quantity of petrol and its cost.
| No. of Litres of petrol | 10 | 15 | 20 | 25 |
| Cost of petrol in ₹ | 500 | 750 | 1000 | 1250 |
Plot a graph to show the data.
Solution:
- Let us take a suitable scale on both the axes.
- Mark the number of litres along the horizontal axis.
- Mark cost of petrol along the vertical axis.
- Plot the points: (10,500), (15,750), (20,1000), (25,1250).
- Join the points.
Example
A bank gives 10% Simple Interest (S.I.) on deposits by senior citizens. Draw a graph to illustrate the relation between the sum deposited and the simple interest earned. Find from your graph
(a) the annual interest obtainable for an investment of ₹ 250.
(b) the investment one has to make to get an annual simple interest of ₹ 70.
| Sum deposited | Simple interest for a year |
| ₹ 100 | ₹ `(100 xx 1 xx 10)/100` = ₹ 10 |
| ₹ 200 | ₹ `(200 xx 1 xx 10)/100` = ₹ 20 |
| ₹ 300 | ₹ `(300 xx 1 xx 10)/100` = ₹ 30 |
| ₹ 500 | ₹ `(500 xx 1 xx 10)/100` = ₹ 50 |
| ₹ 1000 | ₹ 100 |
We get a table of values.
| Deposit (in ₹) | 100 | 200 | 300 | 500 | 1000 |
| Annual S.I. (in ₹) | 10 | 20 | 30 | 50 | 100 |
(i) Scale : 1 unit = ₹ 100 on horizontal axis; 1 unit = ₹ 10 on vertical axis.
(ii) Mark Deposits along the horizontal axis.
(iii) Mark Simple Interest along the vertical axis.
(iv) Plot the points : (100,10), (200, 20), (300, 30), (500,50) etc.
(v) Join the points. We get a graph that is a line.
- Corresponding to ₹ 250 on the horizontal axis, we get the interest to be ₹ 25 on the vertical axis.
- Corresponding to ₹ 70 on the vertical axis, we get the sum to be ₹ 700 on the horizontal axis.
Example
Ajit can ride a scooter constantly at a speed of 30 kms/hour. Draw a time-distance graph for this situation. Use it to find
(i) the time taken by Ajit to ride 75 km.
(ii) the distance covered by Ajit in `3 1/2` hours.
| Hours of ride | Distance covered |
| 1 hour | 30 km |
| 2 hours | 2 × 30 km = 60 km |
| 3 hours | 3 × 30 km = 90 km |
| 4 hours | 4 × 30 km = 120 km and so on. |
We get a table of values.
| Time (in hours) | 1 | 2 | 3 | 4 |
| Distance covered (in km) | 30 | 60 | 90 | 120 |
(i) Scale:
Horizontal: 2
Horizontal: 2
units = 1 hour
Vertical: 1 unit = 10 km
(ii) Mark time on horizontal axis.
(iii) Mark distance on vertical axis.
(iv) Plot the points: (1, 30), (2, 60), (3, 90), (4, 120).
(v) Join the points. We get a linear graph.
(a) Corresponding to 75 km on the vertical axis, we get the time to be 2.5 hours on the horizontal axis. Thus 2.5 hours are needed to cover 75 km.
(b) Corresponding to `3 1/2` hours on the horizontal axis, the distance covered is 105 km on the vertical axis.
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Related QuestionsVIEW ALL [8]
Draw the graphs for the following tables of values, with suitable scales on the axes.
Cost of apples
| Number of apples | 1 | 2 | 3 | 4 | 5 |
| Cost (in ₹) | 5 | 10 | 15 | 20 | 25 |
Draw a graph for the following:
| Side of square (in cm) | 2 | 3 | 3.5 | 5 | 6 |
| Perimeter (in cm) | 8 | 12 | 14 | 20 | 24 |
Is it a linear graph?
Draw the graphs for the following tables of values, with suitable scales on the axes.
Distance travelled by a car
| Time (in hours) | 6 a.m. | 7 a.m. | 8 a.m. | 9 a.m. |
| Distance (in km) | 40 | 80 | 120 | 160 |
- How much distance did the car cover during the period 7.30 a.m. to 8 a.m.?
- What was the time when the car had covered a distance of 100 km since it's start?
Draw the graphs for the following tables of values, with suitable scales on the axes.
Interest on deposits for a year:
| Deposit (in Rs) | 1000 | 2000 | 3000 | 4000 | 5000 |
| Simple interest (in Rs) | 80 | 160 | 240 | 320 | 400 |
- Does the graph pass through the origin?
- Use the graph to find the interest on Rs 2500 for a year:
- To get an interest of Rs 280 per year, how much money should be deposited?
Draw a graph for the following:
| Side of square (in cm) | 2 | 3 | 4 | 5 | 6 |
| Area (in cm2) | 4 | 9 | 16 | 25 | 36 |
Is it a linear graph?
