How can the answer be an exact number when the number of packs are both variables?

That's why I'm confused? It's supposed to be for something called 11+ prep in England for grammar schools. I can't seem to see how they got 99.

My answer is 8x + 5y - 29.. There might be more to the question..

That was my other thought but I've been told this is the full question and the purge parts are not linked.

I have no idea then how they got 99.. :( sorry..

Only 4 part c? Where is a n b? Could it be a continuation?

Thought so to Helen Soh but have been told there isn't any info that helps with C.

I PM u, Sherry

Has to be a multiple of 6 because can fit 6 in a box. Between 15 and 21 only number 18 is a multiple of 6 which is also a multiple of 3. So the answer is 18.

Yup ans is 18 but not sure how the work out shld be

Multiples of 3 are 3,6,9,12,15,18 Multiples of 6 are 6,12,18 So the common multiple is 18

This is a P1 question lor... Difficult to explain to my girl

Can teach her to list down as how Judy said. If she know her 3 and 6 times table she should be able to list down. Just start to list from 15 up to 21. And see which is the common number between the 3 x table and the 6 x table. Or you could draw to explain to her?

Thanks All... Yup I ended up using drawings

Omg, which school?

Jenny Teo... Mine's a girl sch 😩

Haha Hmmm R? Only P1, more to come lady

use LCM of 3 and 6 and clue is given that the number is between 15 n 21, so ans is 18.

The kids will only learn 6 time table in P2. For P1, they will need to draw upto 21 cakes, 2 sets. Then circle in group of 3 in set 1 & group of 6 in the other set of cakes. This is covered in the topic: Grouping.

Doreen, which CHIJ ? My girl is also in CHIJ... but P2 this year 😉

What if my child already knows her 6x table even in p1. Is just listing down an acceptable working? Or must they still draw it out?

Doreen, my twins in OLN too haha I can understand

Still must draw and circle to do grouping. They won't even be allowed to use division sign...because they have not been taught. That was what happen to my girl last year...Singapore's education system....😓

My is in OLQP. I have a friend's daughter in OLN..but P5.

Janne, that's what I did (drawings) to explain to my girl

Chij oln maths super difficult.. I just posted one question.. Give in p3... Test in p5.. Sometimes Im wondering what the school try to do

Maybe they trying to sieve out the very good ones. Hence the more difficult questions that only the smarter ones would know how to do.

Thanks Carolina...

Seriously! P1 kid Math is so tough! How on earth to find time to draw all the boxes during exam! I won't let my kid run dry in this school !

Muz draw 21 cakes out? Then group?

The boxes I drew is to explain the steps. The actual drawing need to be drawn is only on the last step.

Or instead of the boxes, we can draw circles. Then for the cake, we draw lines.

18

40 minus 25 looks correct

But they are 2puzzles

I assume that the 15 who can do both are in the original 23 and 25.

25 + 23 =48 48 - 15 = 33 can solve either one or both 40 - 33 = 7 can solve neither

Any model can explain this question

Use Venn Diagram Answer is 7 as I have PM you.

Thanks thanks.. I think is different to explain this model to my p3 gal

I think there's no other way. This was a tested question in P5. I won't be surprised if the teacher gives the same answer. I remembered I Learnt this in Sec 2 but now this is taught at P5

What!!!! P5... I found in my gal p3 Maths

Haha

Teach her the concept. Not that difficult

Yes

Great....Yes Model method but surprising my niece school used Venn Diagram

Great gals

What level is is for? I can solve it using some pretty complicated algebra. I'd be interested in seeing a different way. Algebraically, the common denominator is 18z. This turns the numerator into 2z^2 + 90 = 27z. This turns into the trinomial equation 2z^2-27z+90=0, This factors into (2z-15)(z-6) = 0 yielding the solutions z=6 or z=7.5. Since numerators and denominators cannot be decimal numbers, we get one solution: z=6.

This is for P4.. Have not learnt algebra yet?

Yikes. My solution will not work for P4. Guess and check?

That's what I thought too... Just wonder if there is a shorter approach to save time...Tks

Follow

LCM is 18 right? So 2 x Z + 15 = 27 27 - 15 = 12 12 / 2 = 6

Must be whole number? Algebraically should have 2 answers, 6 and 7.5.

The setting (the way the question is set) is not appropriate for P4. Without using symbolic algebra, the student can use the idea that the whole number Z has to be even. Start with 2, check and then keep increasing by 2 till the equation is satisfied. Basically a guess and check method. For some students, they may be able to understand Judy's method.

Just wondering if we use guess and check, can we assume the fractions should be expressed in proper fractions, therefore Z should be greater than 5 start checking for Z=6?

Thank you all😊! Judy, Can I know how you get the number 15 in the equation?

15 came from the numerator 5, to be multiplied by 3 to get equivalent fraction

Judy, how did u know have to multiply by 3 when you don't know Z?

I use listing method first

Hui Tong, for P4 students, they learn to add two fractions with different denominators by converting each to the same. Usually, they do not express the simplification in a single fraction. For P4, it is also reasonable to use proper fractions and so, the student can start with 6 and check. As Judy mentioned, she started with listing before she saw the 3. Students are also unlikely to do that.

My method but still involves some guessing....

Tks for all your advice:)

https://www.facebook.com/photo.php?fbid=10153190479244353&set=gm.501265900030071&type=1&theater

For P4 students it is necessary to state that z stands for a whole number. Students will see it as finding the sum of two fractions: z/9 + 5/z As the sum is 3/2, which is equivalent to 6/4, 9/6, 12/8, .... , z must be an even number. By Guess and Check method, students get z=6. That is, 2/3 + 5/6 = 4/6 + 5/6 = 9/6

Thank you all! Tks Adrian for the clear and straightforward explanation👏🏻