PSLE Maths 2012
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Tnx. How about the cupboard question? Not too sure about my answer.
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2.64m for b)
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cardboard answers
a) 16
b) either 2.46 or 2.64. cannot remember the ans -
wargame123:
Part a is 20425. Check ur calculationthe radius of the circle is 50 divided by 2 having 25
use pi r square and get 1962.5
then find the area of the imaginary small square which is 50 times 50 having 2500
use 2500 minus 1962.5 and get 537.5
and times 38 as there are 38 of 537.5 as ther are 38 imaginary squares anf 38 circles which give u 20525 thats for part a
for b its 38 circles minus 4 circles at the corner givibg u 34
use 34 divided 2 giclving u 17 thus 17 circles surrounding 1 length and breathof the rectangle
the circle had a diameter of 50 thus use 50 times 17 which give u 850
as ther are 2 lenght and 2 beath use 850 times 2 giving u 1700
i hope my answer is correct -
wargame123:
the radius of the circle is 50 divided by 2 having 25
use pi r square and get 1962.5
then find the area of the imaginary small square which is 50 times 50 having 2500
use 2500 minus 1962.5 and get 537.5
and times 38 as there are 38 of 537.5 as ther are 38 imaginary squares anf 38 circles which give u 20525 thats for part a
for b its 38 circles minus 4 circles at the corner givibg u 34
use 34 divided 2 giclving u 17 thus 17 circles surrounding 1 length and breathof the rectangle
the circle had a diameter of 50 thus use 50 times 17 which give u 850
as ther are 2 lenght and 2 beath use 850 times 2 giving u 1700
i hope my answer is correct
38 x 537.5 = 20425 but your answer is 20525? -
kaparent:
It should be 20425 and if your answer for (a) is 20425 and b is 1700 your are spot on! My kid answer is also the same. He is his school top student.wargame123:
the radius of the circle is 50 divided by 2 having 25
use pi r square and get 1962.5
then find the area of the imaginary small square which is 50 times 50 having 2500
use 2500 minus 1962.5 and get 537.5
and times 38 as there are 38 of 537.5 as ther are 38 imaginary squares anf 38 circles which give u 20525 thats for part a
for b its 38 circles minus 4 circles at the corner givibg u 34
use 34 divided 2 giclving u 17 thus 17 circles surrounding 1 length and breathof the rectangle
the circle had a diameter of 50 thus use 50 times 17 which give u 850
as ther are 2 lenght and 2 beath use 850 times 2 giving u 1700
i hope my answer is correct
38 x 537.5 = 20425 but your answer is 20525? -
So disappointed...
This year's English and Math papers have all been very easy... -
correct and u r right. i did it over lunch using mental calculation and not by using calculator.
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correct and u r right. i did it over lunch using mental calculation and not by using calculator.
-
the radius of the circle is 50 divided by 2 having 25
use pi r square and get 1962.5
then find the area of the imaginary small square which is 50 times 50 having 2500
use 2500 minus 1962.5 and get 537.5
and times 38 as there are 38 of 537.5 as ther are 38 imaginary squares anf 38 circles which give u 20525 thats for part a
for b its 38 circles minus 4 circles at the corner givibg u 34
use 34 divided 2 giclving u 17 thus 17 circles surrounding 1 length and breathof the rectangle
the circle had a diameter of 50 thus use 50 times 17 which give u 850
as ther are 2 lenght and 2 beath use 850 times 2 giving u 1700
i hope my answer is correct
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