Apt Number System — Free Aptitude Tutorial
Learn Apt Number System in Aptitude with a free, beginner-friendly tutorial, examples and practice for Indian students on Syllab.in.
TL;DR: Learn Apt Number System in Aptitude with a free, beginner-friendly tutorial, examples and practice for Indian students on Syllab.in.
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Apt Number System in Aptitude
Numbers are classified into Natural Numbers (1,2,3...), Whole Numbers (0,1,2...), Integers (...-2,-1,0,1,2...), Rational Numbers (p/q form), Irrational Numbers (√2, π), and Real Numbers.
Even Numbers are divisible by 2 (2,4,6...). Odd Numbers are not (1,3,5...). Prime Numbers have exactly two factors: 1 and itself (2,3,5,7,11...). Composite Numbers have more than two factors.
Divisibility Rules: A number is divisible by 2 if last digit is 0,2,4,6,8. By 3 if sum of digits is divisible by 3. By 4 if last two digits form a number divisible by 4. By 5 if last digit is 0 or 5. By 9 if digit sum is divisible by 9.
HCF (Highest Common Factor) is the largest number that divides two or more numbers exactly. LCM (Least Common Multiple) is the smallest number exactly divisible by each of the given numbers. HCF × LCM = Product of two numbers.
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