Tutor MathsGuru: Ask me for your burning Maths questions!

[tinkfirst]

So sorry to cause any confusion to all. Typo error instead of 6 typed 5. Thank you to Dharma & tianzhu for helping to solve this pattern. Is it common to find these type of Qns in PSLE?

[tianzhu]

tinkfirst:

Is it common to find these type of Qns in PSLE?

Hi

Questions on patterns frequently appear in primary maths exam.You may like to take a look at some of the questions on number patterns from past years testpapers.

For last year’s PSLE question on pattern, you may refer to VC’s post @ Fri Dec 31, 2010 10:16 pm on pg 227 of this thread.

http://www.kiasuparents.com/kiasu/forum/viewtopic.php?t=280&postdays=0&postorder=asc&start=2260

Best wishes

[rrjan]

Hi, could someone kindly help me with this problem? How to solve this using model?


Linda & Roy have a total of 255 stamps. Half of Linda’s stamps is twice as many as Roy’s stamps. How many stamps does Roy have?

Sincere Thanks.

[Yu Xuan]

rrjan:

Hi, could someone kindly help me with this problem? How to solve this using model?


Linda & Roy have a total of 255 stamps. Half of Linda's stamps is twice as many as Roy's stamps. How many stamps does Roy have?

Sincere Thanks.

Draw the model using the following;

Linda --> 4 units
Roy --> 1 unit

Half of Linda is 2 units, this is twice of Roy's 1 unit.

5 units --> 255
1 unit --> 255 / 5 = 51

[rrjan]

Thanks Yu Xuan

[peapot]

Hi everyone! I have a P2 question which I m not sure how to teach. Pls help me!! Thanks!


9_ _ - 99 = _01

How ah???

[bellerina]

Pls help with a P6 Qs. Thanks!


For a few months, Ng used 1/4 of his wkend playing tennis with his friends & 1/2 of his wkdays working in the office. He used up 115 days on tennis & work.
Another 1/2 of his wkend were spent on shopping & 1/4 of his wkdays were spent having dinner & playing soccer with his friends. He used up a total of 74 days on these activities.
He spent the rest of his time reading at home. How many days did he stay at home?

[Dharma]

peapot:

Hi everyone! I have a P2 question which I m not sure how to teach. Pls help me!! Thanks!


9_ _ - 99 = _01

How ah???

999 - 99 = 900
but answer's ones digit is 1. Therefore, the hundreds digit of the answer must be 8
So, answer is 801
Work backwards

9_ _ - 99 = 801
9_ _ - 99 + 99 = 801 + 99
9_ _ = 900

[autolycus]

bellerina:

Pls help with a P6 Qs. Thanks!


For a few months, Ng used 1/4 of his wkend playing tennis with his friends & 1/2 of his wkdays working in the office. He used up 115 days on tennis & work.
Another 1/2 of his wkend were spent on shopping & 1/4 of his wkdays were spent having dinner & playing soccer with his friends. He used up a total of 74 days on these activities.
He spent the rest of his time reading at home. How many days did he stay at home?

Wkends spent = 1/4 + 1/2 = 3/4.
Wkdays spent = 1/2 + 1/4 = 3/4.

That means he spends 3/4 of his week doing stuff. So the 115 days + 74 days = 3/4 of his days.

Time left = 1/4 overall
Days left must be 1/3 of the time spent, since that time was 3/4.

Hence time at home = 1/3 x 189 = 93 days.

In fact we can figure out that this is a period of roughly 10 months.

[peapot]

Thank Dharma,


But my gal haven’t grasp the concept that 999-99 is 900 yet. Any other easier way, I wonder?