2017 PSLE Ribbon Question: Why This Tricky Math Problem Stumped So Many

The PSLE ribbon question from 2017 is a lasting reminder that even questions which look simple at first glance can catch students off guard. Especially in a high-pressure exam setting, small misinterpretations can lead to the wrong answer.

Here’s the full question:

Most students answered 9, but the correct answer is 10. The mistake often came from overlooking unit conversions or rounding down instead of up when dealing with remainders. This PSLE ribbon question highlights the importance of reading carefully and applying concepts accurately, not just relying on formulas.

With the right tools and support, every student can learn to handle these challenges confidently. At Superstar Teacher, students receive instant homework help and guidance that builds deeper understanding. Through online learning, learners develop into self-motivated and confident problem solvers, ready for even the toughest questions.

Below is a live chat conversation between a mentor and student who solved this question together.

Real mentors, Real-time answers

Ben

Hello I need help for this question!

Jess needs 200 pieces of ribbon, each of length 110 cm, to decorate a room for a party. Ribbon is sold in rolls of 25m each. What is the least number of rolls of ribbon that Jess needs to buy?
Let me work on the question
What is the answer you got?
9?
Hmmm, that's incorrect.
Let me go through the question with you.
25m = 2500 cm.
Since each ribbon is 110 cm, we can deduce the number of ribbon each roll will have
2500 / 110 = 22.72
So it tells us that each roll of ribbons can be cut into 22 pieces of 110 cm ribbons
Do you understand so far?
Yes I get it
Ok, so from there since Jess needs 200 pieces of ribbons,

200 / 22 = 9.09.

This tell us that 9 rolls of ribbons is not enough. So we will need 10 rolls of ribbons.

That is the answer for this question.
I see. I get it now
Thank you!
That's good! Any other questions?
Nope
I will proceed to end the session. Goodbye~!
Bye

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