b) 25Originally posted by renorenal:The question:
Which came first, the chicken or the egg?
If a rat is able to lay 10 eggs everyday, how many eggs can it lay for 2 and a half days?
a) 10
b) 25
c) 40
d) 60
e) None
We need to make an assumation:Originally posted by renorenal:The question:
Which came first, the chicken or the egg?
If a rat is able to lay 10 eggs everyday, how many eggs can it lay for 2 and a half days?
a) 10
b) 25
c) 40
d) 60
e) None
all wrong, shld be 20. lay 10 eggs everyday doesnt mean 5 in half a day. logically, it shld be lay 10 eggs at a time so ans = 20Originally posted by renorenal:The question:
Which came first, the chicken or the egg?
If a rat is able to lay 10 eggs everyday, how many eggs can it lay for 2 and a half days?
a) 10
b) 25
c) 40
d) 60
e) None
Uhhh.... aren't rats mammals? Mammals don't lay eggs.... right?Originally posted by renorenal:The question:
Which came first, the chicken or the egg?
If a rat is able to lay 10 eggs everyday, how many eggs can it lay for 2 and a half days?
a) 10
b) 25
c) 40
d) 60
e) None
To learn more about number patterns, not use them during PSLE.Originally posted by ditzy:PSLE can use calculators?![]()
another way is 1 + 97 = 2 +96 = 3+ 95 = ...Originally posted by ndmmxiaomayi:Everything also difficult. Don't study lor. Make your life so hard for what? It is not about PSLE maths paper difficult, it is more about whether you notice the things around you or not.
For example, in the year 2000 PSLE maths paper, students complained about this question: 1 + 2 + 3 + ... +97 =?
And a lot of students will go this way: 1 + 2 + 3 + ... +97 =?
Actually, there's a pattern. When you add 1 to 10, it is 55. When 11 to 20, it is 155. When 21 to 30, it is 255, so on and so forth. If they ever notice this pattern, will they find this question hard?
Take out your calculators and play with the numbers. Don't complain anymore.![]()
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Another method. Cool. But don't understand. I am more of a simple minded person.Originally posted by skyfoo:another way is 1 + 97 = 2 +96 = 3+ 95 = ...
as there's total of 48.5 sets, just multiply 48.5 by 98. as the 4 ans have diff last digit. the one with last digit 3 is the ans. the ans then is (c). i did it in secs then, lol.
seems like the method Federick Gauss used then.Originally posted by skyfoo:another way is 1 + 97 = 2 +96 = 3+ 95 = ...
as there's total of 48.5 sets, just multiply 48.5 by 98. as the 4 ans have diff last digit. the one with last digit 3 is the ans. the ans then is (c). i did it in secs then, lol.
PSLE cannot use calculators...Originally posted by ndmmxiaomayi:Everything also difficult. Don't study lor. Make your life so hard for what? It is not about PSLE maths paper difficult, it is more about whether you notice the things around you or not.
For example, in the year 2000 PSLE maths paper, students complained about this question: 1 + 2 + 3 + ... +97 =?
And a lot of students will go this way: 1 + 2 + 3 + ... +97 =?
Actually, there's a pattern. When you add 1 to 10, it is 55. When 11 to 20, it is 155. When 21 to 30, it is 255, so on and so forth. If they ever notice this pattern, will they find this question hard?
Take out your calculators and play with the numbers. Don't complain anymore.![]()
![]()
![]()
You made the assumption lay 10 at a time. Since the question is plainly a logical game (if then else question .. doesn't have to make sense), we can equally argue the distribution is uniform.Originally posted by skyfoo:all wrong, shld be 20. lay 10 eggs everyday doesnt mean 5 in half a day. logically, it shld be lay 10 eggs at a time so ans = 20
but now got teach in jc and some sec schs though i learned in pri sch.Originally posted by Icemoon:seems like the method Federick Gauss used then.
mind you .. Gauss is rightfully Prince of Mathematics. That method was enuff to stunt even his teacher then. Don't expect the kids today to figure that out.![]()
The concept is simple enuff, I suppose it would be a nice sidetrack when teaching Arithmetic Series.Originally posted by skyfoo:but now got teach in jc and some sec schs though i learned in pri sch.
bcos of him, now we got more advance maths to learn.Originally posted by Icemoon:seems like the method Federick Gauss used then.
mind you .. Gauss is rightfully Prince of Mathematics. That method was enuff to stunt even his teacher then. Don't expect the kids today to figure that out.![]()