Most percentage mistakes in P5 start before any calculation: the pupil picks the wrong number as 100%. Every round makes you do the three steps in order:
Each step you get right first time earns ⭐. Ten rounds, about 5 minutes.
P5 Number & Algebra · Percentage (MOE 2021 syllabus): percentage of a quantity, with the "identify 100% first" habit. Built by Luqman Hakeem in plain HTML and JavaScript, so it runs on any school device with no install.