**2017 PSLE MATHS QUESTION**

You might have heard about the tricky 2017 PSLE Maths question that has been circulating online. If not, this is the question:

*Jess wants 200 ribbons of length 110cm for a party. *

*However, the ribbons were sold at 25m per tape. *

*How many tapes will Jess need?*

At first glance, the solution seems straightforward.

*Length of ribbon needed -> 200 x 110 = 22000cm*

*Length of 1 tape -> 25m = 2500cm*

*Number of tapes needed -> 22000 / 2500 = 8.8 = 9 (when rounded up)*

However, the above solution is incorrect. We are assuming that we can join the remaining ribbons from each tape to form new 110cm ribbons.

The correct working is:

*Length of 1 tape -> 25m = 2500cm*

*Number of ribbons that can be obtained from 1 tape -> 2500 / 110 = 22.72 = 22 (when rounded down)*

*Number of tapes needed -> 200 / 22 = 9.09 = 10 (when rounded up)*

Our P5 pupils covered these types of questions in Term 4. Click the image below to see if you can use this concept to solve similar types of questions.