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Core Math Concepts: Greatest Common Divisor 150 150 SchoolTutoring Academy

Core Math Concepts: Greatest Common Divisor

The greatest common divisor (gcd), also known as highest common factor (hcf), or greatest common factor (gcf), of two integers a and b is defined as the largest integer that divides both a and b without remainder. The greatest common divisor of two integers a and b is denoted as gcd(a, b). Example: Greatest common…

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Physical and Chemical Changes 150 150 SchoolTutoring Academy

Physical and Chemical Changes

Physical changes Physical changes are changes that do not affect the chemical composition of a substance. No new product is formed during physical change. Physical changes are concerned with energy and states of matter. Many physical changes are reversible using physical means. For example, salt dissolved in water can be recovered by boiling the water…

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Variance and Standard Deviation 150 150 SchoolTutoring Academy

Variance and Standard Deviation

The variance and standard deviation are measures of how spread out a distribution is. These are widely used to measure variability or diversity. Standard deviation is a number that indicates how much on average each of the values in the distribution deviates from the mean (or center) of the distribution. Variance measures the same thing…

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What are Ecosystems? 150 150 SchoolTutoring Academy

What are Ecosystems?

An ecosystem is defined as a community of organisms living in a particular environment and the physical elements with which they interact. Ecosystems vary in size. It can be as small as a tree and as large as an ocean. Ecosystem, also known as ecological system, is an open space built by physical and biological…

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Measures of Central Tendency 150 150 SchoolTutoring Academy

Measures of Central Tendency

A measure of central tendency is a single value that describes a set of data by identifying the central position within the set of data. The mean, median and mode are the measures of central tendency. Mean The mean or average is the most commonly used measure if tendency. It is equal to the sum…

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Angles of Polygons 150 150 SchoolTutoring Academy

Angles of Polygons

Polygons are closed geometric figures made with straight lines.           Sum of interior angels The sum of the interior angles of a convex polygon of ‘n’ sides is given as: S = (n – 2) × 180° Examples: Triangle has 3 sides, sum of interior angles is (3 – 2) ×…

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Types of Polygons 150 150 SchoolTutoring Academy

Types of Polygons

The word ‘polygon’ is derived from Greek words poly- which means ‘many’ and -gon means ‘corner’ or ‘angle’. Polygons are closed (all the lines joined) geometric figures made of straight lines. Types of Polygons If all the angles and sides are equal, the polygon is called regular polygon, otherwise it is irregular. A simple polygon…

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Atoms: The Basic Building Blocks 150 150 SchoolTutoring Academy

Atoms: The Basic Building Blocks

Democritus, a Greek philosopher, developed the idea of atoms. But his idea was dismissed by other Greek philosophers.  In 1800’s, John Dalton, an English chemist performed experiments with various chemicals that showed that matter seems to consist of elementary particles. He did not know about their structure. That particle is known as at atom today.…

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States of Matter: Solids, Liquids, and Gases 150 150 SchoolTutoring Academy

States of Matter: Solids, Liquids, and Gases

Matter is anything that occupies space and has mass. Solid, liquid and gas are the most common forms (or states) of matter. Solid A solid has a certain shape and size. We need to apply force size of a solid object. For example, a wooden plank does not change its shape or size itself. The…

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Chemistry Concepts: Atomic Symbol, Atomic Number, Atomic Mass 150 150 SchoolTutoring Academy

Chemistry Concepts: Atomic Symbol, Atomic Number, Atomic Mass

An atom is a basic building block of matter around us. Each atom is consists of the fundamental particles. Electron is negatively charged, proton is positive and neutron is neutral. Electrons revolve around positively charged nucleus which is made of protons and neutrons. Atomic symbol The atoms of all the elements are represented by a…

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