160 gold fish, 154 molly and 34 guppies

Thank you Hon Kee n Joscelin ☺️

Thank you Izam Marwari

Q18

Q19

Q20 Since a palindrome is a number that reads the same backwards or forward, its first and last digits must be the same. Hence, if the first digit of a number is 1, and the number is a palindrome, its last digit will also be the same. Use this info to solve Q20.

Just curious, is Q20 P4 standard? Is palindrome taught in P4? My gal is P4 and she is taking Math Olympiad, I have not seen her doing this topic yet.. Don't scare me 😰

Yes,I am also taking Math Olympiad

This is a 2011 past year paper

No background knowledge about palindrome is required for this question.

Sufficient information has already been given.

Then is you minus 16 from 126 then divide by 5 right?

Can you write the statement down for me I don't understand

The lightly shaded portion that is given away. Alice's books are indicated by blue models, Ben's by green, and Charlie's by orange.

The "60 books" represents the fully shaded parts of the model only. The lightly shaded part of the model is not included.

Thank you !

For each wrong answer ...Kelly lose 3 marks... Assume all 40 are correct->40x2=80 marks 80-56-=24 24/3=8 wrong answers 40-8=32 correct answers Check {32x2}-{8x1)-> 64-8=56

Izam Marwasi master PSLE math liao

Zhong Shu Hao...thankyou... Always looking for better solution.. Still learning stage...

There is some "modifications" you can do

Since the question is asking for number of CORRECTLY answered questions, you may assume all questions to be WRONGLY answered.

You will use 1 less step.

OK... Just point out any mistake...I will definitely take it up...

You won't need this step :D

Its not logical to assume all wrong as it be no points. Using the assumption method, what Izam Marwasi did according to the steps.

why not? you can get the same answer with 1 less step

But of course.... you must be know what you are doing.

Thanks for the answer! Btw, why 3 marks are deducted for wrong answer instead of 1 mark?? Sorry don't really understand this part...

Deduct 1 plus the loss of 2 marks if she had gotten the answer correct.

Ok thanks!