IKMC 2027 - Grades 3-4 - Self-study SET 1 - Thematic Batch 3 Question 4

A flea can jump up either 1 stair or 2 stairs at a time.
In how many ways can it jump from the floor to the fifth stair?
Diagram labels: “Sàn nhà” means floor; “Bậc” means stair.