Complete guide to Problems on Numbers for competitive exams: two-digit and three-digit number problems, digit interchanging problems (reversing digits, difference between number and reverse), sum of digits problems, number algebra (consecutive numbers, even and odd numbers, prime numbers), forming numbers from given conditions, number ratio problems, fraction and decimal number problems, LCM and HCF based number problems, divisibility based problems, remainder problems (using remainder theorem), number of factors and multiples, sum of digits cyclic problems, word problems on numbers with linear equations, shortcut tricks and formulas for SSC, Banking, Railway, UPSC, and other government exams.