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Pattern Anatomy

Each pattern, deconstructed.

arithmetic-expression-decomposition

"AMC가 매년 가장 많이 내는 패턴"

★ Rank 1/19 32.2% of all AMC problems Grade 5–7 ★★★★★

A multi-step numerical computation (sum of fractions, rate × time, area × thickness) is attacked by splitting it into a small number of independent subproblems whose answers are then combined. The key move is identifying the clean split, not the underlying topic.

복잡한 식을 작은 조각으로 — 27년간 AMC 8 문제의 35%가 이 패턴.

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Sample problem
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amc8-2024-2
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27-year frequency
1999–2026 ↓ 39%
2026 forecast slots
#1 #2 #3 #4 #5 #6 #7 #8 #9 #10 #11 #12 #13 #14 #15 #16 #17 #18 #19 #20 #21 #22 #23 #24 #25
Champion: [email protected]

How to solve

Primary tools simplifymath-tools
What to look for
  • Keep the structure (rate × time) but swap context from CO2 to bacteria population or tuition inflation
  • Make one of the sub-fractions reducible by 11 or 101 to mirror Problem 2's clean cancellation
  • Adjust numeric_scale so the convenient round-number shortcut (e.g. 1.5 × 50) still applies

Sub-archetype mix (6)

Click a row to see member problems.

More data (year-over-year, tool fingerprint, grade distribution, all members)
291
members
1999–2026
Active years
Year-over-year

Tool fingerprint (1–17)

Grade distribution

  • Gr 2
    5
  • Gr 3
    9
  • Gr 4
    48
  • Gr 5
    40
  • Gr 6
    127
  • Gr 7
    23
  • Gr 8
    37