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CodeSignal

Divisibility Shortcuts

via CodeSignal

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Overview

You'll master quick divisibility tests for 2, 3, 4, 5, 6, 9, and 10 — learning to tell at a glance whether a number is divisible by any of these and understanding why each shortcut works in base ten.

Syllabus

  • Unit 1: Last Digit Divisibility Rules
    • Last Digit Divisibility
    • Match Numbers To Divisibility Descriptions
    • Finding Divisible Prices
    • Explain Last Digit Reasoning
  • Unit 2: Digit Sum Shortcuts
    • Finish The Digit Sum Checks
    • Find Divisibility From Digit Sums
    • Checking Meter Reading Divisibility
    • Explain Digit Sum Reasoning
  • Unit 3: Divisibility by 4
    • Divisibility by Four
    • Find Seats Divisible By Four
    • Justify The Rule For Four
  • Unit 4: Divisibility by Six
    • Divisibility by Six Practice
    • Finish Divisibility By Six Statements
    • Deciding Divisibility By Six
  • Unit 5: Applying All Divisibility Rules
    • Match Numbers To Divisibility Statements
    • Complete Divisibility Statements
    • Finding Divisibility From Numbers
    • Which Numbers Divide Evenly
    • Explain Rule Relationships

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