P6 problem sum

• quailmaster

  4 May 09, 22:50

  The number of guppies Peter have is 25% the number of swordtails he has. Peter sold 3 guppies and 10 swordtails. The number of guppies left is 20% the number of swordtails left. How many fishes does Peter have in the beginning?

  anyone can solve this without using algebra?

   

• dkcx

  4 May 09, 22:59

  draw model lo, i leave it to those who can draw it to draw and show u

• syncopation_music

  4 May 09, 23:35

  Originally posted by quailmaster:

  The number of guppies Peter have is 25% the number of swordtails he has. Peter sold 3 guppies and 10 swordtails. The number of guppies left is 20% the number of swordtails left. How many fishes does Peter have in the beginning?

  anyone can solve this without using algebra?

   

  25% is 1/4

  guppies = 1/4 of swordtail

   

   

   

• syncopation_music

  4 May 09, 23:59

  Originally posted by quailmaster:

  The number of guppies Peter have is 25% the number of swordtails he has. Peter sold 3 guppies and 10 swordtails. The number of guppies left is 20% the number of swordtails left. How many fishes does Peter have in the beginning?

  anyone can solve this without using algebra?

   

   

  doesnt work out to be the correct answer ... is there any figures that is wrong ?

   

   

• dkcx

  5 May 09, 00:06

  I can work it out, ans is 25 fishes, 5 guppies, 20 swordtails

• Lee012lee

  5 May 09, 01:28

  Bar Models can be drawn by using the rectangle tools in Microsoft Word. Next, upload it to websites eg photobucket and then link it to homework.sgforums.com ie post it as a picture file in the forum.

  To really help the PSLE maths students, please use model drawing method (not using secondary school algebra) to solve PSLE problem sums.

• baiyun

  5 May 09, 08:30

  Hi

  Hope this helps.

  

• quailmaster

  5 May 09, 09:37

  Hi baiyun,

  could you explain the first step? 4 units + 12 --> 5 units + 10

  Hi dkcx,

  think the main challenge for p6 students is not just getting the answers but how to do it without algebra

• baiyun

  5 May 09, 10:56

  Originally posted by quailmaster:

  Hi baiyun,

  could you explain the first step? 4 units + 12 --> 5 units + 10

  
  Hi

  1 big unit ---- 1 smaller unit+3

  In the beginning, you have 4 units (4*(1 small unit+3) for swordfish and in the end, 5 small units +10.

  Therefore you have 4 small units+12 ----  5 small units +10

  In the model, the 1 small unit is designated as 1 unit

  Hope it's clear to you.

• dkcx

  5 May 09, 11:35

  Originally posted by quailmaster:

  Hi dkcx,

  think the main challenge for p6 students is not just getting the answers but how to do it without algebra

  That requires drawing the model and personally i simply use trial and error and not algebra to do those sums cos i can work it out faster mentally than using algebra to form equations etc.

  Anyway i gave the final answer to prove the question was correct and not flawed as what syncopation_music said

• syncopation_music

  5 May 09, 13:57

  Originally posted by dkcx:

  That requires drawing the model and personally i simply use trial and error and not algebra to do those sums cos i can work it out faster mentally than using algebra to form equations etc.

  Anyway i gave the final answer to prove the question was correct and not flawed as what syncopation_music said

  okay ,agree