Used the Kaya toast percentage (20%) instead of working out the unknown slice. 20% × 40 = 8. Forgot that the unknown slice must be calculated by subtracting the known slices from 100%.
PRIMARY 4 · MATHEMATICS
Pie Charts
Top 5 mistakes
Ranked by how often they appear across 22 MOE-aligned practice questions in our archive.
Used the Pandan cake percentage (30%) instead of finding the unknown slice. 30% × 40 = 12. Confused which slice the question is asking about.
Added the three KNOWN percentages (25 + 30 + 20 = 75%) and computed 75% of 40 = 30. This gives the total of the other three groups, not the Ondeh-ondeh slice.
This answer confuses the percentage label with the number of students. Football is 40% of the students, but 40% does not mean 40 students. You must calculate 40% × 200 to find the actual count.
This answer comes from reading Football's percentage as 30% instead of 40%, then calculating 30% × 200 = 60. Check the pie chart label carefully — Football is 40%, not 30%.
Want to fix these mistakes for your child?
Superholic Lab's quiz engine flags every misconception by name and routes your child to targeted practice in our 3-day Plan Quest. Free 7-day trial.
Start a free 7-day trial →