Number System
96 UPSC CSE (Prelims) Basic Numeracy previous year questions (PYQs) from 10 papers, 2017 to 2026, with answers and worked solutions.
About this chapter
- Difficulty: 12 easy · 60 moderate · 24 hard.
- Most-asked subtopics: Digits and Place Value (30), Divisibility and Remainders (25), Factors, Multiples, HCF and LCM (17).
- Updated 29 August 2026.
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#1HardFactors, Multiples, HCF and LCM
#2ModeratePowers and Exponents
#3ModerateUnit Digit and Powers
#4EasyPowers and Exponents
#5HardFactors, Multiples, HCF and LCM
#6HardDivisibility and Remainders
#7ModerateDigits and Place Value
#8ModerateDigits and Place Value
#9ModerateDigits and Place Value
#10EasyUnit Digit and Powers
#11ModerateDivisibility and Remainders
#12HardDivisibility and Remainders
#13HardDigits and Place Value
#14ModerateDigits and Place Value
#15HardDivisibility and Remainders
#16HardDivisibility and Remainders
#17EasyDigits and Place Value
#18ModeratePerfect Squares and Cubes
#19HardDivisibility and Remainders
#20ModerateDigits and Place Value
#21EasyFactors, Multiples, HCF and LCM
#22ModerateDigits and Place Value
#23ModerateFactors, Multiples, HCF and LCM
#24EasyFractions and Recurring Decimals
#25ModerateDivisibility and Remainders
#26ModerateDivisibility and Remainders
#27HardPrime Numbers and Factorisation
#28HardDivisibility and Remainders
#29ModerateUnit Digit and Powers
#30ModerateDivisibility and Remainders
#31ModerateFactors, Multiples, HCF and LCM
#32ModeratePrime Numbers and Factorisation
#33ModerateDigits and Place Value
#34ModerateParity of Numbers
#35ModerateDigits and Place Value
#36ModerateDivisibility and Remainders
#37ModeratePrime Numbers and Factorisation
#38ModerateDigits and Place Value
#39ModeratePrime Numbers and Factorisation
#40ModerateDigits and Place Value
#41ModerateFactors, Multiples, HCF and LCM
#42ModerateDigits and Place Value
#43ModerateDigits and Place Value
#44EasyPowers and Exponents
#45ModerateFactors, Multiples, HCF and LCM
#46ModerateFractions and Recurring Decimals
#47ModerateFactors, Multiples, HCF and LCM
#48ModerateDivisibility and Remainders
#49ModerateDigits and Place Value
#50ModerateFactors, Multiples, HCF and LCM
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