Mathematics

Pie Charts

The most common mistakes Singapore primary students make in Pie Charts, distilled from 69+ MOE-aligned questions across P4, P6. Free practice at every level.

From the question bank

Top 10 mistakes in Pie Charts

  1. #1Misconception

    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%.

    Seen in 1 question

  2. #2Misconception

    Used the Pandan cake percentage (30%) instead of finding the unknown slice. 30% × 40 = 12. Confused which slice the question is asking about.

    Seen in 1 question

  3. #3Partial logic

    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.

    Seen in 1 question

  4. #4Misconception

    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.

    Seen in 1 question

  5. #5Calc error

    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%.

    Seen in 1 question

  6. #6Calc error

    Computed new Food amount = $140 and treated it as 100 units out of 360 by dividing 360 by ($400 / $140) approximation, mis-converting to degrees.

    Seen in 1 question

  7. #7Misconception

    Mistook the $20 transfer as 5% of the WHOLE pie and subtracted 5% off the original 40% as an angle: 40 - 5 = 35 percent, then computed 35 x (360 / 100) - 1 = 125° and rounded to 135°.

    Seen in 1 question

  8. #8Partial logic

    Used the ORIGINAL Food percentage 40% and converted directly to degrees: 0.40 x 360 = 144°, ignoring the $20 transfer out of Food.

    Seen in 1 question

  9. #9Misconception

    Took only potato 1/5 of 540 = 108 and reported that as the vegetable count.

    Seen in 1 question

  10. #10Misconception

    Took only chicken 1/4 of 540 = 135 and reported that as the vegetable count.

    Seen in 1 question

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