Exercise · L2

Complement ladder to five

complements complements 7 min 数五

L2Level

complementsSkill

complementsType

7mTime

Best for

Best for focused single-question practice and careful method review.

Practice rule: try this before opening the hint or answer.

State the pairs that complete five from 1 through 4.

Reusable visual engine

Visual support for Complement ladder to five

Value 5 · 五

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