Look at this series: 544, 509, 474, 439, ... What number should come next?

Given data

• Sequence: 544, 509, 474, 439, ...

Concept/ApproachConstant decrement sequence.

Step-by-step calculation544 − 509 = 35509 − 474 = 35474 − 439 = 35Next = 439 − 35 = 404

Verification/AlternativeAll differences equal −35, so the pattern is consistent.

Common pitfalls

• Mis-subtracting the 35 difference.

Final Answer404