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MMSE Folstein 1975

Mental Math (100−7)

Subtract 7 from 100, then 7 from the result, and so on 5 times. Classic MMSE test for working memory and sustained attention.

Start with 100. Subtract 7. Type the result. Then subtract 7 from the new result. Continue for 5 steps.

Example: 100 → 93 → 86 → 79 → 72 → 65

What does serial subtraction test?

Serial subtraction 100−7 was introduced by Folstein in 1975 as part of the Mini-Mental State Examination (MMSE) — the most widely used cognitive screening instrument in the world. It tests working memory (holding the current number in mind while performing the operation), sustained attention (5 consecutive steps without errors), plus basic arithmetic ability.

In clinical MMSE scoring, 4–5 correct answers out of 5 is considered normal. 2–3 correct is a warning signal. Fewer than 2 correct may indicate cognitive deficits worth investigating.

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Scientifically verified sources

Based on scientific research

Calcul mental is a digital adaptation of clinically validated neuropsychological tests. Below you will find the official sources underpinning the methodology, along with international and Romanian medical institutions you can consult for a professional assessment.

📚 Studies and clinical validation

The original scientific papers and validation studies that demonstrate this paradigm measures what it claims to measure.

🌍 Recommendations from international medical institutions

Global organisations (NIH, Mayo Clinic, Alzheimer's Association, WHO, Lancet) that recommend cognitive training as part of a healthy routine for older adults. Direct links to official documents.

🇷🇴 Clinical assessment in Romania

If low scores recur, speak with a doctor. Here is where you can seek specialist advice in Romania — the only national Alzheimer's NGO, the relevant ministry, university neurology clinics, and accredited medical universities.

Important: This game is informational and educational. It is not a medical diagnostic tool. For a clinical assessment, consult a neurologist or psychiatrist. Repeatedly low scores are worth discussing with your GP as an indicator (similar to weighing yourself at home), not as a diagnosis.