Using trial and error 504 = 12 x 42 => difference 30 504 = 21 x 24 => difference 3 So first number is between 12 and 21 and second number between 24 and 42 504 = 18 x 28 => difference is 10 The numbers are 18 and 28. 28 is the answer since it is the larger number. Bigger sounds grammatically off!

Got it thank you very much Pearlyn.

You are welcome. Algebra will solve it faster methinks but they won't allow.

A P5 child won't quite get quadratic equations so Guess and Check with proper tables and headings should do the trick.

Thank you.

Guess & check. The last digit of 504 is a 4, which can only be achieved by _2 x _2 or _8 x _8 since difference is 10. So just try 12 x 22 & 18 x 28. Quick calculation reveals 18 x 28. Ans: 28

Thank you very much.

Yes, thks Carolina. I used the same method as yrs. how abt a non algebra method for this qn?

Trial and error 3 books @$8 => total $24 4th book Plus $36 New total $60 => average $15 5 books @$8 => total $60 6th book Plus $36 New total $96 => average $16 6 books @$8 => total $48 7th book Plus $36 New total $84 => average $12 Answer : 7 books

Step 1. find the change in average. 12~8=4 step 2. find the reason for the change. In this case the new book was $28 above average. 36~8=28 That 28 is redistributed to each of the books so that eacj book gets $4. so to find the number of books 28 ÷ 4 = 7 books=

Difference in average = 12 - 8 = 4 36 - 12 = 24 24 / 4 = 6 (Divide the value 24 by difference of 4, and you get 6 books) 6 + 1 = 7 books total

361.

Can provide steps?

Sq of 1st digit combined (not addition) with sq of 2nd digit. But I don't think this is a good logic question.

Is this the given answer?

I dun hv model answer. It's a practice paper from school

Yeah 361

Yes

361

Logical meh??

Logical meh??

Ok I got it. But really no logic leh

Yeah agree no logic. But Nathanael Goh seems to see it quite quickly leh.. hmm

361

361

This is not a good question at all. If square of a digit (and patterns derived from it) the objective , then it should be crafted in a better way.

361

361

6x6,1x1

361

There is no pattern from one triangle to the next. The pattern is within the individual triangle itself.

Any sample PSLE maths question one can download? Find that the std of maths questions differ. Better to refer to MOE guidelines

361

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361 but super no logic! !! What has maths become..???

60-10=50cm^2

How to get 60? Can provide steps?

First step is to recognise that Triangle DZC is the half of the rectangle which is 60cm^2. Secondly, with the additional area of DXY (10 cm^2), the shaded area is therefore 60-10=50.

Thanks