Prelim 2025 Queries by https://padlet.com/PHPPSMathdept/m5wcntnujgtde2gf Post your response to the discussion topic by clicking the plus button below. en-us 2025-08-20 02:55:38 UTC 2025-08-29 04:03:43 UTC hello@padlet.com https://padlet.net/icons/png/1f4ac.png phppsmath https://padlet.com/PHPPSMathdept/m5wcntnujgtde2gf/wish/3551488976 Prelims Ans Key 22 Aug 5 pm


]]> 2025-08-22 09:02:11 UTC https://padlet.com/PHPPSMathdept/m5wcntnujgtde2gf/wish/3551488976 https://padlet.com/PHPPSMathdept/m5wcntnujgtde2gf/wish/3551572003 Q1: There is an additional step behind the M1 which resulted in the wrong answer. Still award the M1 or no M1?

]]> 2025-08-22 11:32:07 UTC https://padlet.com/PHPPSMathdept/m5wcntnujgtde2gf/wish/3551572003 https://padlet.com/PHPPSMathdept/m5wcntnujgtde2gf/wish/3551594266 (b) should be M0A0. Wrong method because student used distance travelled in 45 HOURS divided by extra distance travelled in an hour.

]]> 2025-08-22 12:05:31 UTC https://padlet.com/PHPPSMathdept/m5wcntnujgtde2gf/wish/3551594266 https://padlet.com/PHPPSMathdept/m5wcntnujgtde2gf/wish/3551599417 ... and this one 0 marks?

]]> 2025-08-22 12:14:34 UTC https://padlet.com/PHPPSMathdept/m5wcntnujgtde2gf/wish/3551599417 https://padlet.com/PHPPSMathdept/m5wcntnujgtde2gf/wish/3551599823 Why is this answer 0.5 marks...

]]> 2025-08-22 12:15:14 UTC https://padlet.com/PHPPSMathdept/m5wcntnujgtde2gf/wish/3551599823 https://padlet.com/PHPPSMathdept/m5wcntnujgtde2gf/wish/3551609293 Units should be litres only. But in this case, can we accept litres per minute since the question asked for litres in one minute?

]]> 2025-08-22 12:28:15 UTC https://padlet.com/PHPPSMathdept/m5wcntnujgtde2gf/wish/3551609293 https://padlet.com/PHPPSMathdept/m5wcntnujgtde2gf/wish/3551621212 Part (b) can give M1?

]]> 2025-08-22 12:43:01 UTC https://padlet.com/PHPPSMathdept/m5wcntnujgtde2gf/wish/3551621212 https://padlet.com/PHPPSMathdept/m5wcntnujgtde2gf/wish/3551628522 (a). Method is correct, but should be penalised for wrong mathematical statement. Should this be M1-0.5 + A1 = Total 1.5 instead of A1 only?

]]> 2025-08-22 12:53:33 UTC https://padlet.com/PHPPSMathdept/m5wcntnujgtde2gf/wish/3551628522 phppsmath https://padlet.com/PHPPSMathdept/m5wcntnujgtde2gf/wish/3551682791 Alternative method for P1 Q28:


Total Area of Figure + 4x10 rectangle = 6x6 + 22x14 + 10x10 +10x4 = 484


Smaller triangle to take away --> 1/2 x 6 x 28 = 84

Larger triangle to take away --> 1/2 x 14 x 32 = 224


Shaded area = 484 - 84 - 224 (M1) = 176 (A1)

]]> 2025-08-22 13:48:03 UTC https://padlet.com/PHPPSMathdept/m5wcntnujgtde2gf/wish/3551682791 https://padlet.com/PHPPSMathdept/m5wcntnujgtde2gf/wish/3551697532 Part (a) Confirm there is a half mark deduction? If there is, what kind of deduction does this fall under? Thanks!

]]> 2025-08-22 14:03:36 UTC https://padlet.com/PHPPSMathdept/m5wcntnujgtde2gf/wish/3551697532 phppsmath https://padlet.com/PHPPSMathdept/m5wcntnujgtde2gf/wish/3552637738 Alternative answer

Accept equivalent forms

]]> 2025-08-24 07:21:12 UTC https://padlet.com/PHPPSMathdept/m5wcntnujgtde2gf/wish/3552637738 phppsmath https://padlet.com/PHPPSMathdept/m5wcntnujgtde2gf/wish/3552638184 Q30


Label to penalise 0.5 if wrongly written for both figures.

]]> 2025-08-24 07:22:33 UTC https://padlet.com/PHPPSMathdept/m5wcntnujgtde2gf/wish/3552638184 phppsmath https://padlet.com/PHPPSMathdept/m5wcntnujgtde2gf/wish/3552640094 Q29b

Positive evidence of A = 540 and B = 500 students before A1 of School A to be awarded.

]]> 2025-08-24 07:28:42 UTC https://padlet.com/PHPPSMathdept/m5wcntnujgtde2gf/wish/3552640094 phppsmath https://padlet.com/PHPPSMathdept/m5wcntnujgtde2gf/wish/3552647653 Suggestion:

(2y + 3) kg A1

2y + 3 kg A0.5

3 + 2y kg A0.5

3kg + 2y A0.5

2y + 3 A0.5

]]> 2025-08-24 07:50:07 UTC https://padlet.com/PHPPSMathdept/m5wcntnujgtde2gf/wish/3552647653 https://padlet.com/PHPPSMathdept/m5wcntnujgtde2gf/wish/3552804917 Dear all, please check (a)

Units need to be L/min, if student only write L as units, deduct 1/2m please since it's unit of rate. Thanks!

]]> 2025-08-24 14:25:47 UTC https://padlet.com/PHPPSMathdept/m5wcntnujgtde2gf/wish/3552804917 https://padlet.com/PHPPSMathdept/m5wcntnujgtde2gf/wish/3553350516 For this qn, student used 60 instead of 64. Can this have 1 method mark?


]]> 2025-08-25 04:26:05 UTC https://padlet.com/PHPPSMathdept/m5wcntnujgtde2gf/wish/3553350516 https://padlet.com/PHPPSMathdept/m5wcntnujgtde2gf/wish/3553352873 Student used 60 instead of 64. Can this be award m1?

]]> 2025-08-25 04:27:43 UTC https://padlet.com/PHPPSMathdept/m5wcntnujgtde2gf/wish/3553352873 https://padlet.com/PHPPSMathdept/m5wcntnujgtde2gf/wish/3553746151 Q30 Note alternative answer

]]> 2025-08-25 10:57:18 UTC https://padlet.com/PHPPSMathdept/m5wcntnujgtde2gf/wish/3553746151 phppsmath https://padlet.com/PHPPSMathdept/m5wcntnujgtde2gf/wish/3554436369 Updated marks allocation for Q14(b)


Method 1

M1 to find 8400 as total salary

M1 to express 420/8400 as fraction

A1 for accurate answer


Method 2

M1 to find 20u as total salary

M1 to express 1/20 as fraction

A1 for accurate answer


Please help to relook to ensure method marks are given based on this allocation. Thank you!

]]> 2025-08-25 22:34:45 UTC https://padlet.com/PHPPSMathdept/m5wcntnujgtde2gf/wish/3554436369 phppsmath https://padlet.com/PHPPSMathdept/m5wcntnujgtde2gf/wish/3554439531 Alt solution

]]> 2025-08-25 22:40:46 UTC https://padlet.com/PHPPSMathdept/m5wcntnujgtde2gf/wish/3554439531 lew_kai_keng https://padlet.com/PHPPSMathdept/m5wcntnujgtde2gf/wish/3559943679 Latest Answer Key 29 August @12noon

]]> 2025-08-29 04:03:41 UTC https://padlet.com/PHPPSMathdept/m5wcntnujgtde2gf/wish/3559943679