MoCA Calculation Skills 2

Question 1

Which MoCA task most directly evaluates calculation and numerical reasoning skills?

Accepted Answer

Serial 7 subtraction

Answer

The serial 7 subtraction task (100, 93, 86, 79, 72, 65) is the primary arithmetic task in the MoCA and is the standard measure of calculation under the attention/concentration domain.

Question 2

How is the MoCA serial 7 task scored when a patient gives the sequence 93, 87, 80, 73, 66?

Accepted Answer

3 points

Answer

Each subtraction is scored independently from the prior answer. 93 is correct (100-7=93); 87 is incorrect (93-7=86); 80 is correct (87-7=80); 73 is correct (80-7=73); 66 is correct (73-7=66). That is 4 correct = 3 points.

Question 3

A patient who scores 0 on serial 7s but performs well on all other MoCA domains likely has difficulty with:

Accepted Answer

Selective arithmetic or sustained concentration difficulty

Answer

Zero on serial 7s in isolation may indicate selective arithmetic difficulty, high test anxiety, or limited education rather than global cognitive impairment, especially when other domains are intact.

Question 4

What is the maximum score possible for the serial 7 subtraction task?

Accepted Answer

3 points

Answer

Serial 7s is scored out of 3 points: 4-5 correct subtractions = 3 pts, 2-3 correct = 2 pts, 1 correct = 1 pt, 0 correct = 0 pts.

Question 5

Why is serial 7 subtraction considered a measure of cognitive functioning beyond simple arithmetic?

Accepted Answer

Because it requires working memory and sustained mental effort

Answer

Serial 7 subtraction requires holding the previous answer in working memory while performing a calculation, taxing attention, concentration, and working memory simultaneously — not just arithmetic ability.

(MoCA) Montreal Cognitive Assessment Practice Test

(MoCA) Montreal Cognitive Assessment Practice Test

MoCA Calculation Skills 2