Paper I · 9 Logical Reasoning & Analytical Ability · 9.13 Logic puzzles and problem solving

9.13.1 Cryptarithms: letter-to-digit sums and products

In a cryptarithm each letter is a different digit; solve it column by column from the units, using three levers — the carry (never more than 1 when two numbers are added), the leading digit (never 0, and 1 when the sum gains a digit) and unit-digit patterns.

  • APPSC Paper I · Paper I
  • Standard level
  • 7 min read
  • Full course

Key terms

  • cryptarithm
  • alphametic
  • letters for digits
  • missing digits
  • carry
  • column addition
  • leading digit
  • unit digit
  • reversal number
  • automorphic number
  • digit puzzle

What this note covers

  1. Core factsFoundation
  2. ExplainedStandard
  3. DeeperAdvanced
  4. Common trapsFoundation
  5. Quick revisionFoundation

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