Help with this GCSE Maths question please?Watch

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#1
Here is the question:

Work out an estimate for the value of
(0.49 x 0.61)^2

It's a non-calculator question and I'd be grateful if someone could explain it to me, thanks.
0
#2 0
3 years ago
#3
round so 0.49 goes to( 0.50 *0.60 ) which is 0.3 and square it let me know if its the right answer in ur answer scheme
0
3 years ago
#4
you do 0.5 x 0.6 as the rule of BIDMAS says brackets are first
then you do that in your method of multiplicaction
then once you have found the answer square it by using a method of multiplication
0
3 years ago
#5
(Original post by epoddoulc)
Here is the question:

Work out an estimate for the value of
(0.49 x 0.61)^2

It's a non-calculator question and I'd be grateful if someone could explain it to me, thanks.
0.09
0
3 years ago
#6
0.5*0.6 is 0.3 squared is 0.09
0
3 years ago
#7
--
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3 years ago
#8
(Original post by epoddoulc)
Here is the question:

Work out an estimate for the value of
(0.49 x 0.61)^2

It's a non-calculator question and I'd be grateful if someone could explain it to me, thanks.
When ever is says estimate you round everything to 1SF
0
#9
Thanks everyone, I have an exam tomorrow and this really helped.
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3 years ago
#10
Basically (0.5x0.6)=0.3 0.3 squared is 0.09
0
3 years ago
#11
(Original post by junayd1998)
When ever is says estimate you round everything to 1SF
If there's a 0 on its own before the decimal- i.e. in 0.543154- then you don't treat it as a significant figure.

If it's between other numbers- i.e. 1042.3153- then it is treated as a significant figure.

Basically, 0.x to 1sf = 0.[x rounded].
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3 years ago
#12
Can someone help me with this question:
Work out the value of x:
root 8 = 8 to the power of x
0
3 years ago
#13
(Original post by Baaah)
Can someone help me with this question:
Work out the value of x:
root 8 = 8 to the power of x
Write 'root 8' in a different way, so that you end with something that looks like '8 to the power of (something)', which will be x.

root 8 is the same as writing 8 to the power of 1/2, or a half.

So, x = 1/2
0
3 years ago
#14 0
3 years ago
#15
(Original post by Baaah)
Can someone help me with this question:
Work out the value of x:
root 8 = 8 to the power of x
Isn't the value of x just 1/2? So it'd be root 8 = 8 to the power of 1/2 as the 2 is just a square root so they'd be the same value.
0
3 years ago
#16
(Original post by Baaah)
Can someone help me with this question:
Work out the value of x:
root 8 = 8 to the power of x
X=1/2 because when indices are fractions you always do the root the same as denominator so for example cube root 8= 8 to the power of 1/3
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3 years ago
#17
(Original post by Baaah) K is 3/2 which is same as 5 to power 1 which gives 5 then 5 to root 1/2 which gives square root 5. 1+1/2=3/2
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3 years ago
#18
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3 years ago
#19
Good luck to you all for tomorrow!
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3 years ago
#20
(Original post by Baaah) K=1.5 because 5 to the power of 1 is 5 and 5 to the power of a half is root 5. So k must be 1+1/2 which = 1.5
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