Exercise · L5

Four-step mental balance

anzan anzan 8 min 数四六

L5Level

anzanSkill

anzanType

8mTime

Best for

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

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

Solve 42 - 9 + 16 - 3 mentally and keep the running total stable after each step.

Reusable visual engine

Visual support for Four-step mental balance

Value 46 · 四六

Step 1

Step 2

Step 3

Step 4

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1. Solve first 2. Write your response 3. Verify or reveal

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