
General Ability Quantitative Ability/Reasoning ; Logical Reasoning ; Analytical Reasoning/Ability ; Mental Abilities 
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Number System
Number System: The collection of numbers is called the number system.
Natural Numbers: All the numbers starting from 1 till infinity are natural numbers, such as 1,2,3,4,5,6,7,8,…….infinity. Whole Numbers: All the numbers starting from 0 till infinity are whole numbers such as 0,1,2,3,4,5,6,7,8,9,…..infinity. Integers: Integers are the whole numbers which can be positive, negative or zero. Example: 2, 33, 0, 67. Rational Numbers: A number which can be represented in the form of p/q is called a rational number. For example, 1/2, 4/5, 26/8, etc. Irrational Numbers: A number is called an irrational number if it can’t be represented in the form of ratio. Example: √3, √5, √11. Real Numbers: The collection of all rational and irrational numbers is called real numbers. Real numbers are denoted by R. Terminating Decimals: If the decimal expression of a/b terminates. i.e. comes to an end, then the decimal so obtained is called Terminating decimals. Example: ¼ =0.25 Repeating Decimals: A decimal in which a digit or a set of digits repeats repeatedly periodically is called a repeating decimal. Example: ⅔ = 0.666…
Ordinal Numbers: The ordinal numbers are the numbers which denote the position of something. Example Ahmad is in 5th class. 5th is ordinal number. 
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