Q&A - P4 Math

[MathIzzzFun]

Breadandmuffins:

There was an equal number of boys and girls in the class at first. Halfway, another 12 boys came into the class and 8 girls left the class. In the end, there were twice as many boys as girls in the class. How many students were there in the class at first?


Thank you.

Hi

here's the MD.. you should be able to complete the solution...

http://i45.tinypic.com/2lny1cl.png\">

cheers.

[24hr-mum]

hi tianzhu


can u draw the MD for the questions on clips that i posted earlier?
where the ans is 114?

[Breadandmuffins]

:thankyou: for the very fast response....with the explanation, its really much clearer to me now.

[tianzhu]

24hr-mum:

hi tianzhu


can u draw the MD for the questions on clips that i posted earlier?
where the ans is 114?

Hi

A likely way P4 kids would use will be MD.

There are alternate ways to present the MD.

As usual, I’ve drawn more MD than necessary, once students understand the logic behind the solution, they may consolidate the steps.

Mother's Day is just around the corner.

Wishing all sweetest, kindest and dearest mummies, be happy and healthy every day.

Best wishes

Hope this helps.

Best wishes.

http://farm8.staticflickr.com/7059/7134604523_da0dc89dc6_z.jpg\">

[24hr-mum]

why in 3rd model the 3unit +8 is dulpicated?


when shd draw usg the before and when use the After model?

[tianzhu]

24hr-mum:

why in 3rd model the 3unit +8 is dulpicated?


when shd draw usg the before and when use the After model?

Hi

The number of blue clips is twice the number of yellow clips.

We want to make a comparison so as to get the answers.

Before and after models show the before and after scenarios

Best wishes

[optimistforum]

Hi


Does anyone know of a useful site to gain better practise of tesellationms/nets, please? My DS is using EPH P4 Challenging Maths (Sandhya Sundar), but be need some practise of the basis first

[Breadandmuffins]

During a quiz a correct answer would be awarded 3 points while 2 points would be deducted from a participant for a wrong answer. For every 6 questions answered, Jane managed to get 5 of them correct. Given that jane earned a total of 104 points, how many questions did Jane answer correctly?


Ds 's teacher uses the on sponge method called "number of units and value of units". He asked me when should he use this method cos he thinks it’s possible to use guess and check too. Is there any way to tell? Do youthink model can be used here?

Thank you so much.

[MathIzzzFun]

Breadandmuffins:

During a quiz a correct answer would be awarded 3 points while 2 points would be deducted from a participant for a wrong answer. For every 6 questions answered, Jane managed to get 5 of them correct. Given that jane earned a total of 104 points, how many questions did Jane answer correctly?


Ds 's teacher uses the on sponge method called \"number of units and value of units\". He asked me when should he use this method cos he thinks it's possible to use guess and check too. Is there any way to tell? Do youthink model can be used here?

Thank you so much.

Hi

guess and check can be used but it is not efficient for this question. For this question, one can use the grouping concept.
Since for every 6 questions, Jane answered 5 correctly, and therefore 1 wrongly, she would score 15-2 =13 points for every 6 question.
104/13 = 8 ie 8 groups of 6 questions --> 5 questions were answered correctly in each group, so 8 x 5 = 40 questions were answered correctly.

cheers.

[small]

Hi,


Same as MathIzzzFun mentioned, I think 'grouping concept' will be a better choice.

Given that for every 6 questions answered (1 group), Jane managed to get 5 of them correct, so Jane earned (15-2) = 13 points

Total score is 104 points

104 / 13 = 8 groups

8 x 5 = 40 questions were answered correctly.