# gcse maths estimation

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#1
a buzzer beeps every 1111 seconds. work out an estimate for the number of times the buzzer beeps in 1 week. ( this question is from corbettmaths and on the answers page it says 504/500 but i don't understand how to solve the problem)
Last edited by adoreapple; 1 month ago
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1 month ago
#2
What have you tried?
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#3
(Original post by Esme9812)
What have you tried?
I rounded 1111 to 1000, then found how many seconds there are in a day (60 x 60 x 24 = 86400) 86400/1000 = 86.4 then I multiplied by 7 to get 604.8 .But that answer is wrong.
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1 month ago
#4
(Original post by cloudystarsxo)
I rounded 1111 to 1000, then found how many seconds there are in a day (60 x 60 x 24 = 86400) 86400/1000 = 86.4 then I multiplied by 7 to get 604.8 .But that answer is wrong.
that's close and along the right lines but remember because it is estimation you should round everything to 1 significant figure.

So you round 1111 to 1000
and you round 24 to 20.
Last edited by Esme9812; 1 month ago
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1 month ago
#5
(Original post by Esme9812)
that's close and along the right lines but remember because it is estimation you should round everything to 1 significant figure.
Please edit - you are breaking forum rules by posting a solution
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1 month ago
#6
(Original post by Muttley79)
Please edit - you are breaking forum rules by posting a solution
sorry, I didn't realise. Is that better?
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1 month ago
#7
(Original post by Esme9812)
sorry, I didn't realise. Is that better?
Yes thanks
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#8
(Original post by Esme9812)
that's close and along the right lines but remember because it is estimation you should round everything to 1 significant figure.

So you round 1111 to 1000
and you round 24 to 20.
Thank you, I understand now. But when doing estimations, do I always have to round to 1 significant figure?
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1 month ago
#9
(Original post by cloudystarsxo)
Thank you, I understand now. But when doing estimations, do I always have to round to 1 significant figure?
Yes, the mark scheme will expect you to have rounded to 1 significant figure.
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