For guess & check method, you should not need more than 4 tries to get the correct answer. I always teach my students to use 3 tries maximum to save time. For P6 students, I rather they use algebra to solve if they are good enough.
This is a discussion on P3 Maths,any fastest way to solve? within the Primary School Registration and Academic forum, part of the Singapore Kiasu Parents Forum category; Is there any fastest way to solved the below questions,besides guess and check.That method is time consuming. Thanks 1) Mrs ...
Is there any fastest way to solved the below questions,besides guess and check.That method is time consuming. Thanks
1) Mrs Ng bought a total of 13 chicken and fish.She paid $86 for them.If each chicken cost $8 and each fish cost $6,how many fish did Mrs Ng buy?
2) Ramu saw 26 sheeps and chicken in a farm.He counted 76 legs.How many sheeps are there?
For guess & check method, you should not need more than 4 tries to get the correct answer. I always teach my students to use 3 tries maximum to save time. For P6 students, I rather they use algebra to solve if they are good enough.
Sorry, I came accross this thread.. Curious.. I usually work backwards, starting with the biggest possible no....
For question 2):
18 x 4 = 72 legs
76 - 72 = 4 legs / 2 = 2 chickens?
OR
17 x 4 = 68 legs
76 - 68 = 8 legs / 2 = 4 chickens?
So is 18 sheeps or 17 sheeps?
So many possible ans? Or am I calculating it wrongly..
Hi Kitty. Agree with Stonston. For P3, the least confusing way is thru guess n check. There is another way to solve the above Qns besides algebra but the thinking process is too advance for P3. So wont recommend it for P3, maybe P5 or P6.
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One way I can do is to list out all the mulitplication for 8 from 1 to 12... and mulitplication for 6 from 1 to 12.... and from there... match the total number for 86?
So say.... after I have done all that... match all the possible total number of 13...eg.... 8 + 5, 7 + 6, 9 + 4, etc...... then you will see that 9 + 4 give the right answer . meaning... 4 chicken and 9 fish? something like that.