# Mathematics - Class IX Resources

The following list of online resources are provided as a sample of curated resources. New resources shall be added as we come across interesting and relevant online materials.

#### 1. Laws of Exponents

Description: The given link has explained the laws of exponents in a simple way.

Core Concepts: IX-A1 Laws of exponent.

#### 2. Fractional Exponents

Description: This web link explains the relation of fractional exponents with the root form.

Core Concepts: IX-A1   Fractional exponents.

#### 3. Rational and Irrational Numbers

Description: Introduction on rational and irrational numbers.

Core Concepts: IX-A2  Rational and irrational numbers.

#### 4. Approximating the Values of Irrational Numbers

Description: Placing the irrational numbers on the number line.

Core Concepts: IX-A2 Plotting rational and irrational numbers on the number line.

#### 5. Online Number line Simulation

Description: Placing the irrational numbers on the number line.

Core Concepts: IX-A2 Plotting rational and irrational numbers on the number line.

#### 6. Number System

Description: Pdf. file on number system to connect the rational and irrational numbers with real numbers.

Core Concepts: IX-A2 Concept on real numbers.

#### 7. Introduction to Sets

Core Concepts: IX-A3 Definition of sets.

#### 8. Types of Sets

Core Concepts: IX-A3 Types of sets.

#### 9. Sets and Venn Diagram

Description: This web link describes about types of sets and representing each set with Venn diagram.

Core Concepts: IX-A3 Venn diagram.

#### 10. Set Operations

Description: This link explains operations on sets such as intersection, union, and complimentary.

Core Concepts: IX-A3 Operations on sets.

#### 11. Income, Expenditure and Budget

Description: The link contains a video on how to plan your personal budget.

Core Concepts: IX-A4 Household finance.

#### 12. Simple Interest

Description: The link contains a video which can help to introduce simple interests.

Core Concepts: IX-A4 Simple interest.

#### 12. Simple Interest

Description: The link contains concepts on definition of polynomials, degree of polynomial, terms and types of polynomials (monomial, binomial and trinomial).

Core Concepts: IX-B1 Polynomials.

#### 14. Add and Subtract Polynomials

Description: The link contains a video tutorial on addition and subtraction of polynomials pictorially and symbolically.

Core Concepts: IX-B1 Add and subtract polynomials.

#### 15. Pattern and Relation

Description: Pictorial and table pattern worksheet.

Core Concepts: IX-B2 Pattern and relation.

Description: Pattern Rule worksheet.

Core Concepts: IX-B2 Pattern and relation.

Description: Video lesson on identifying the function from the table of values.

Core Concepts: IX-B2 Types of relation.

#### 16. Scatter Plot

Description: Creating scatter plot using table of values.

Core Concepts: X-B2 Scatter plot.

#### 17. Algebra Basics: Solving Basic Linear Equations

Description: This video explains about the meaning of linear equations and balancing the equations on both sides.

Core Concepts: IX-B3 Linear equations.

#### 18. Solving Linear Equations Using Inverse Operations

Description: This link contains are PDF file with steps of solving a linear equations using an inverse operation.

Core Concepts: IX-B3 Linear equations.

#### 19. Algebra: Solving Linear Equations

Description: This video demonstrates solving linear equations using inverse operations.

Core Concepts: IX-B3 Solving linear equations.

#### 20. Multi-Step Inequalities

Description: This weblink contains a video that teaches how to solve linear inequalities in stepwise.

Core Concepts: IX-B3 Solving linear inequalities.

#### 21. Solving Linear inequalities

Description: This weblink contains a video that teaches how to solve linear inequalities in stepwise.

Core Concepts: IX-B3 Solving linear inequalities.

#### 22. Precision of the instrument

Description: This web link contains a video on understanding the concept of  precision with examples.

Core Concepts: IX-C1 Precision and accuracy of 2-D shapes.

#### 24. Significant Figures

Description: The link can be used to understand the meaning of significant figures and rules for counting significant figures. It also contains an online significant figure calculator.

Core Concepts: IX-C1 Precision and accuracy of 2-D shapes.

#### 23. Constructing a Regular Polygons in GeoGebra

Description: This video contains a tutorial on constructing polygons in GeoGebra.

Core Concepts: IX-C2 Exploring efficiency of 2-D shapes

24. Finding Area and Perimeter in GeoGebra

Description: This video contains a tutorial on finding area and perimeter of a shape in GeoGebra.

Core Concepts: IX-C2 Finding area and perimeter.

#### 25. 2-D Efficiency

Description: This link has a video from Bhutan ELibrary. It contains a lesson on 2-D efficiency.

Core Concepts: IX-C2 2-D Efficiency.

#### 26. Sides of the Triangle and Online quiz

Description: Description about the sides of the triangle and Practice questions on identifying the sides.

Core Concepts: IX-C3 Naming the sides of the triangle.

#### 27. Trigonometry ratios

Description: Definition of trig ratios, introduction of primary trig ratios and a video lesson related to the concept.

Core Concepts: IX-C3 Trigonometry ratios.

#### 28. Worksheet on Pythagorean Theorem

Description: Worksheet on application of Pythagorean theorem in finding the missing side length.

Core Concepts: IX-C3 Pythagorean theorem.

#### 29. Trigonometric Identities

Description: Explanation of Pythagorean identity and trig identities.

Core Concepts: IX-C3 Basic trig identities.

#### 30. Worksheet on Calculating Side Length

Description: Calculating side length of a triangle using trig ratios.

Core Concepts: IX-C3 Application of trig ratios.

#### 31. Angles of Elevation and Depression

Description: lesson introduction about angles of elevation and angles of depression, solved example and practice question.

Core Concepts: IX-C3 Angles of elevation and depression

#### 32. Video Tutorial about Value of Sin, Cos and Tan

Description: Finding the value of sin, cos and tan using a calculator.

Core Concepts: IX-C3 C Determining the value of trig ratios with the given angle.

#### 33. Video Lesson of Angles of Elevation and Angles of Depression

Description: Explanation of angles of elevation and angles of depression.

Core Concepts: IX-C3 Angles of elevation and depression.

#### 34. Video lesson on Area of Polygons

Description: Visual explanation about finding the area of polygons.

Core Concepts: IX-C3 Area of polygons.

#### 35. Live Worksheet on Sides of a Right Triangle

Description: Self assessment live worksheet on sides of a right triangle.

Core Concepts: IX-C3 Sides of a right triangle.

#### 36. Trigonometry Worksheet

Description: Worksheet to  find the value of trig ratios with the given angle using a calculator.

Core Concepts: IX-C3 Determining the value of trig ratios with the given angle.

#### 37. Triangle Congruence Theorems Explained

Description: This video contains lessons on congruent triangles and conditions of congruence explained.

Core Concepts: IX-D1 Congruence triangles and properties.

#### 38. Similarity of Triangles

Description: This video contains lessons on similar triangle properties and conditions for similarity explained.

Core Concepts: IX-D1 Similar triangles and properties.

#### 39. Math Shorts Episode 3 - Translation

Description: This video explains the basic concept of translations.

Core Concepts: IX-D2 Translations.

#### 40. Math Shorts Episode 4 - Reflection

Description: This video explains the basic concept of reflections.

Core Concepts: IX-D2 Reflections.

#### 41. Math Shorts Episode 2 - Rotation

Description: This video explains the basic concept of rotations.

Core Concepts: IX-D2 Rotations.

#### 42. Math Shorts Episode 14 - Dilation

Description: This video explains the basic concept of dilations.

Core Concepts: IX-D3 Dilations.

#### 43. Which Chart To Use

Description: The Link contains concepts related to questions to ask when deciding which type of chart to use.

Core Concepts: IX- E1 Collecting, displaying and analyzing data.

#### 44. Compare Various Methods Of Displaying Data

Description: The link contains concepts on which graph to choose for a given set of data.

Core Concepts: IX- E1 Collecting, displaying and analyzing data.

Description: The web link explains the meaning and features of misleading graph.

Core Concepts: IX- E1 Collecting, displaying and analyzing data.

#### 46. Math Antics - Basic Probability

Description: This link contains a video tutorial which explains the basic concept of probability in a simple way.

Core Concepts: IX-E2 Probability.

#### 47. Probability

Description: This link contains a video tutorial from Bhutan E-library. It explains about the probability of independent events.

Core Concepts: IX-E2 Dependent and independent events. 