The Ledger

Track a running total through a chain of plus and minus steps, entirely in your head.

Trains working-memory updating (verbal/numeric) — holding and updating a running total across a chain of steps. · free, no account needed

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How it works

A chain of plus/minus steps is read out one at a time. You track the running total mentally and enter it once the chain ends. Chain length and step size scale with rank, and step signs are generated so that no two consecutive steps exactly cancel each other out.

This is the free sample exercise. No account, no sign-in, and nothing about the learner is recorded.

Ranks

Apprentice
Clerk
Bookkeeper
Head Accountant