March 11, 2016 Grade 8, Math, Playing With Numbers

Definition A number is a mathematical tool which is used in counting individual quantities, calculating and quantifying. Watch Number System Videos to learn more.The natural (or counting) numbers are 1, 2, 3, 4, 5, etc. There are infinitely many natural numbers. The Natural Numbers The natural (or counting) numbers are 1, 2, 3, 4, 5, etc. There are infinitely many natural numbers. The set of natural numbers, […]

March 11, 2016 Grade 8, Math, Understanding Quadrilaterals

Definition A parallelogram is a four-sided flat shape whose opposite sides are both equal and parallel. Parallelogram has a special property of opposite sides being parallel and opposite angles being equal. A parallelogram is a quadrilateral, in which diagonals bisect each other. The area of a parallelogram is given by the the product of the length of any […]

March 11, 2016 Grade 8, Math, Understanding Quadrilaterals

Definition Rectangle is a quadrilateral with opposite sides parallel and right interior angles. In Euclidean plane geometry, a rectangle is any quadrilateral with four right angles. A rectangle is an equal angular parallelogram with four right angles measuring 90 degrees. The area of a shape is defined as the number of square units that cover a closed figure.Watch Rectangle Video to […]

March 11, 2016 Grade 8, Math, Practical Geometry

Definition Practical geometry is the construction of geometrical objects , and it is an important branch of geometry. There are specific instruments/tools and specific ways and rules for construction of every object. We have to construct a a unique quadrilateral by different conditions like, When four sides and one diagonal are given, When two diagonals […]

March 11, 2016 Grade 8, Introduction to Graphs, Math

Definition Pictograph is a visual presentation of data using icons, pictures, symbols, etc., in place of or in addition to common graph elements (bars, lines, points). Pictographs use relative sizes or repetitions of the same icon, picture, or symbol to show comparison. Also called pictograph, pictorial chart, pictorial graph, or picture graph.Watch Pictograph Video to learn more. Pictograph Pictographs are likely the earliest form of written language humankind ever utilized.These pictographic systems, […]

March 11, 2016 Grade 8, Introduction to Graphs, Math

Definition A bar graph is a mathematical representation of data. A bar graph displays data visually and is sometimes called a bar chart or a bar graph. Data is displayed either horizontally or vertically and allows viewers to compare items displayed. Data displayed will relate to things like amounts, characteristics, times and frequency etc. A […]

March 11, 2016 Grade 8, Math, Squares and Square Roots

Definition The square root of a number is a number which multiplied by itself, gives you the original number. The square root sign is √ . √16 means the square root of 16. 4 x 4 = 16 The square root of 16 is 4. √16 = 4.Watch Square Root Property Of A Number Videos to learn […]

March 10, 2016 Grade 8, Math, Practical Geometry

Area of Parallelogram A parallelogram is a four-sided flat shape whose opposite sides are both equal and parallel. Parallelogram has a special property of opposite sides being parallel and opposite angles being equal. A parallelogram is a quadrilateral, in which diagonals bisect each other. The base of a parallelogram is the length of any one of its sides. The […]

March 10, 2016 Grade 8, Introduction to Graphs, Math

Bar Graph A bar graph is a mathematical representation of data. A bar graph displays data visually and is sometimes called a bar chart or a bar graph. Data is displayed either horizontally or vertically and allows viewers to compare items displayed. Data displayed will relate to things like amounts, characteristics, times and frequency etc. […]

March 10, 2016 Cubes and Cube Roots, Grade 8, Math

Cube of a Number A cube number is a number that is the product of three numbers which are the same. A cube is a number multiplied by itself three times (Watch Cube of Number Video to learn more). The cube of 2 is 8 (2 x 2 x 2). Step-1: Write numbers in a row of 4 terms […]

March 10, 2016 Data Handling, Grade 8, Math

Frequency Distribution Frequency distributions can show either the actual number of observations falling in each range or the percentage of observations. Frequency distributions are visual displays that organize and present frequency counts so that the information can be interpreted more easily (Watch Frequency Distribution Videos to learn more). A frequency distribution is an arrangement of the values […]

March 10, 2016 Cubes and Cube Roots, Grade 8, Math

Definition The cube root of a number is a number when multiplication three times gives that number.( Watch Cube Root of Number Video to learn more). Cube Root of a Number Determine the Cube Root Ignore the last three digits of the number called out by the spectator and choose the memorised cube which is just […]

March 10, 2016 Grade 8, Math, Practical Geometry

Common 3D Shapes 3D shapes have faces (sides), edges and vertices (corners). The exception is the sphere which has no edges or vertices. A 3D shape is a geometric figure that has three dimensions, width, depth and height. 3D shapes differ from 2D shapes because they have thickness. Example: cube, cuboids, triangular prism etc (Watch […]

March 10, 2016 Factorisation, Grade 8, Math

Factorisation Factorization is the decomposition of an object into a product of other objects, or factors, which when multiplied together give the original. Factorization is a method of writing numbers as the product of their factors or divisors. Prime factorization is finding the factors of a number that are all prime (Watch Factorisation Video to learn more). As […]

March 10, 2016 Algebraic Expressions and Identities, Grade 8, Math

Algebraic Expression and Identities An algebraic expression is a mathematical phrase that can contain ordinary numbers, variables (like x or y) and operators (like add,subtract,multiply, and divide). Variables are Letters represent an unknown or generic real number. Constants are Fixed values, like 2 or 7. An algebraic equation is an equation that includes one or more variables […]

March 10, 2016 Grade 8, Introduction to Graphs, Math

CIRCLE GRAPH Pie charts are circle graphs divided into sectors, each pie sector displaying the size of some related piece of information. Pie charts are used to show the relative sizes of the parts of a whole. A circle graph is also known as a pie chart. The graph is in the shape of a circle with different […]

March 10, 2016 Direct and Inverse Proportions, Grade 8, Math

DIRECT PROPORTION Two quantities x and y are said to be in direct proportion if they increase (decrease) together in such a manner that the ratio of their corresponding values remains constant. That is if y /x =k, (k is a positive number), then x and y are said to vary directly.Watch DIRECT PROPORTION VIDEOS […]

March 10, 2016 Exponents and Powers, Grade 8, Math

EXPONENTS AND POWERS The exponent of a number can be defined as how many times to use the number in a multiplication. An expression that represents repeated multiplication of the same factor is called a power. Usually, a power is represented with a base number and an exponent. The base number tells what number is being multiplied. The exponent, a small number written above […]

March 10, 2016 Grade 8, Introduction to Graphs, Math

GRAPHICAL REPRESENTATION Diagrams are very helpful in solving many mathematical problems involving functions. They are especially helpful in solving optimization problems, which occur throughout economic theory. Graphical representation of data helps in faster and easier interpretation of data. A bar graph is a mathematical representation of data. A bar graph displays data visually and is […]

March 10, 2016 Grade 8, Introduction to Graphs, Math

HISTOGRAM A histogram is a visual display of information. It uses bars to show the frequency of an item of data in successive intervals. A histogram is a display of statistical information that uses rectangles to show the frequency of data items in successive numerical intervals of equal size. In the most common form of histogram, the independent […]

March 10, 2016 Direct and Inverse Proportions, Grade 8, Math

INVERSE PROPORTION Two quantities x and y are said to be in inverse proportion if an increase in x causes a proportional decrease in y (and vice-versa) in such a manner that the product of their corresponding values remains constant. That is, if xy = k, then x and y are said to vary inversely.Watch […]

March 10, 2016 Grade 8, Math, Squares and Square Roots

SQUARE OF NUMBER The square of a number is the number times itself.The definition of a perfect square is a number that is the result of a number multiplied by itself. To square a number, we multiply it by itself. eg. 4 squared (written as 42 ) = 4 x 4 = 42 = 16. […]

March 10, 2016 Grade 8, Math, Practical Geometry

SURFACE AREA AND VOLUME OF A CUBE A cuboid, whose length, breadth and height are all equal, is called a cube. A cube has 6 equal and plane surfaces. All the faces of a cube are square in shape. The perimeter of a shape is defined as the distance around the shape.Watch SURFACE AREA AND […]

March 10, 2016 Grade 8, Math, Practical Geometry

SURFACE AREA AND VOLUME OF A CUBOID The cuboid has 6 rectangular faces. The opposite rectangular plane surfaces are identical (equal in all respects). It has 8 vertices and 12 edges. The perimeter of a shape is defined as the distance around the shape.Watch SURFACE AREA AND VOLUME OF A CUBOID VIDEO to learn more. […]