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TEAS MathematicsFast factoring

Divisibility RulesATI TEAS 7 cheat sheet

Fast factoring

9 key facts Reviewed Oct 2026
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The Rules

  • 2 — the last digit is even
  • 3 — the digit sum is divisible by 3
  • 4 — the last two digits are divisible by 4
  • 5 — ends in 0 or 5

More

  • 6 — divisible by both 2 and 3
  • 9 — the digit sum is divisible by 9
  • 10 — ends in 0

Use

  • Simplify fractions fast and spot factors without dividing

Worked

  • 5,184: even → ÷2; 5+1+8+4 = 18 → ÷9 as well
Key takeaway

Fast factoring

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