Q&A - PSLE Math

[greenfinger]

a)Each of the three cards is printed with a different whole number.The smallest number is 25.Two cards are drawn at a time and the numbers on the cards are added together.The sums are 56,68 and 74


What is the largest number on the cards? :?


PLs anyone guide me ,thank you

[Hifive]

Hi


Need help with this question:

http://www.flickr.com/photos/62186744@N04/5679456052/in/photostream/

This is from thinkingMath@onSponge P6 book. Don't quite understand the solution provided on the back of the book. Would like to seek help if there's another method to solve this question. Thanks in advance.

[corneyAmber]

greenfinger:

a)Each of the three cards is printed with a different whole number.The smallest number is 25.Two cards are drawn at a time and the numbers on the cards are added together.The sums are 56,68 and 74


What is the largest number on the cards? :?


PLs anyone guide me ,thank you

My logic as follows:

56 is the smallest added number, hence 25 should be part of 56.

So 56-25 = 31 is the next card.

The last card would be 68-25 = 43 (since 68-31 = 19 <25)

Test it on 74-43 = 31

So the 3 cards are: 25, 31 and 43.

Btw, what level is this question?

[corneyAmber]

offtopic here greenfinger… I see that your nick is greenfingers…are you very good in keeping a garden?

[MathIzzFun]

Hifive:

Hi


Need help with this question:

http://www.flickr.com/photos/62186744@N04/5679456052/in/photostream/

This is from thinkingMath@onSponge P6 book. Don't quite understand the solution provided on the back of the book. Would like to seek help if there's another method to solve this question. Thanks in advance.

Hi

Hope this helps :lol:

http://www.flickr.com/photos/62167097@N02/5679183503/in/photostream

cheers.

[tianzhu]

shurley197323:

Pls help. John had 993 tables and chairs at first.

After he sold 2/5 of the tables and 5/8 of the chairs, he had 459 tables and chairs left.
How many tables did he sell?

Hi

This question touches on simultaneous concepts.

If a student is familiar with SE, he/she may use it.
If not, he/she may solve the two equations pictorially or use the “Alphabet Method”

Tables sold ------ TT
Tables left ------ TTT

Chairs sold ------ CCCCC
Chairs left ------ CCC

TTT + CCC ------- 459, hence T+C ------- 153

TT + CCCCC ----- 534 (993 – 459), therefore C -------- 76

T ------- 153 – 76 ------ 77

Tables sold ------- 2*77 ------- 154.

Best wishes

[Pen88n]

ksi:

greenfinger:

a)Each of the three cards is printed with a different whole number.The smallest number is 25.Two cards are drawn at a time and the numbers on the cards are added together.The sums are 56,68 and 74


What is the largest number on the cards? :?


PLs anyone guide me ,thank you

My logic as follows:

56 is the smallest added number, hence 25 should be part of 56.

So 56-25 = 31 is the next card.

The last card would be 68-25 = 43 (since 68-31 = 19 <25)

Test it on 74-43 = 31

So the 3 cards are: 25, 31 and 43.

Btw, what level is this question?

Doesn't look like a primary Maths questions from syllabus. Seems more like a Maths Olympiad type fo question to me. :lol:

[greenfinger]

To all reply ,thank you very much.appreciated



Me helping my daughter :level P6

THANKS AGAIN :celebrate:

[Neat]

[quote]Hi


Please help with the following:

Jack read 18 pages of a book on Saturday. He read 5/9 of the remainder on Sunday. He still had 1/3 of the book left. How many pages are there in the book?

I really don't know how to tackle fraction kind of question. Please advise how to improve on this?

Thanks a lot.[/quote]

[shurley197323]

Thanks. Tianzhu. Very clear to my girl.