Q&A - P4 Math

[jacsplace]

Are there any websites – other than this forum of course – where maths questions are posted up and explanations provided on how to solve them?

[Jamesbond]

Sudden confusion.....Pl clear my doubts...

Q1)
What is the best estimate of the value 4.59*101?
1)400
2)450
3)460
4)500

Q2)A rectangular garden measures 2.25m by 3m. What is the area of the garden? Round off your answer to 1decimal place.
Is the answer 6.5 or 6.8 for this.... :scratchhead:

[Jamesbond]

quekcc:

Q1, best estimate is 460 = 4.6 x 100


Q2, evaluate the answer and then round-off to 1 decimal, so should be 6.8.

Regarding Q1, Why cant we change the decimal into whole numbers? So I opted for 4) 500. Pl clear my doubt....

[Poppet]

Mr Lim received a year-end bouns of $4135.Mrs Lim received a year-end bouns of $6940.They each spent an equal amount of money on Christmas gifts.Mrs Lim was left with 4 times as much money as Mr Lim.How much money did they spent in all?



Can anyone help to solve this question? :thankyou:

[Pen88n]

Poppet:

Mr Lim received a year-end bouns of $4135.Mrs Lim received a year-end bouns of $6940.They each spent an equal amount of money on Christmas gifts.Mrs Lim was left with 4 times as much money as Mr Lim.How much money did they spent in all?



Can anyone help to solve this question? :thankyou:

Before:
Mr Lim: [$4135]
Mrs Lim: $6940 = [$4135] + [$2805]

After:
Mr Lim: [1u]
Mrs Lim: [1u][1u][1u][1u]

Since they spent same amount, looking at the before state, the [$4135] of both parties should be reduced to [1u] after the spending.

Thus, from Mrs Lim side:
3u = $2805
u = $935

Spending = ($4135 - $935) x 2 = $6400

[jwxh]

plse help me with this question:


Siti, Rahmesh and Peter had 528 stickers at first. Siti bought another 32 stickers, Ramesh gave 1/5 of his stickers away and Peter was given as many stickers as he had at first by his father. In the end, all three of them had equal number of stickers. Find the number of stickers Siti had at first.

[BigDevil]

Something wrong with the question :?

I can't divide evenly.

[cathycho]

jwxh:

plse help me with this question:


Siti, Rahmesh and Peter had 528 stickers at first. Siti bought another 32 stickers, Ramesh gave 1/5 of his stickers away and Peter was given as many stickers as he had at first by his father. In the end, all three of them had equal number of stickers. Find the number of stickers Siti had at first.

Is the answer 168?

[jacsplace]

Are there any websites – other than this forum of course – where maths questions are posted up and explanations provided on how to solve them?

[Lexmark]

Maybe?

http://www.onsponge.com/forum/35-thinkingmath.html