Serial sevens is an attention test involving what?

• A. Repeated subtraction from 100
• B. Drawing a clock
• C. Copying a figure
• D. Recalling a list of words

Answer: (A)

Serial sevens tests attention and sustained concentration. The task requires you to focus, follow a rule, and keep performing a continuous mental calculation by subtracting seven from the starting point (100) and reporting each result. This ongoing, error-checked process demands maintaining attention, resisting distraction, and monitoring for mistakes across multiple steps (for example: 100 → 93 → 86 → 79, and so on). It’s different from other quick screenings: drawing a clock assesses visuospatial planning and executive function, copying a figure tests visuospatial construction, and recalling a list of words taps short-term memory. So the act of repeatedly subtracting seven from 100 best captures attention and concentration.