Sustained Attention

Serial Subtraction - 1

Perform mental arithmetic under working memory load. Solve each drill by computing the sequence mentally and entering comma-separated results.

Mental MathWorking Memory3 DrillsSequence Accuracy

①

Drill 1: Start 400, Subtract 6

Rule: Start with 400 and subtract 6 ten times. Write all numbers separated by commas.

Expected: 10 numbers

②

Drill 2: Start 500, Subtract 8

Rule: Start with 500 and subtract 8 ten times. Write all numbers separated by commas.

Expected: 10 numbers

③

Drill 3: Start 300, Subtract 7

Rule: Start with 300 and subtract 7 ten times. Write all numbers separated by commas.

Expected: 10 numbers