Math Boffins
22 February 2012, 08:06 AM
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Math Boffins
V=TxR Transpose to make R the subject
S=VxW Transpose to make W the subject
The answers I got were wrong according to the teacher, so what do you make the correct answers?
S=VxW Transpose to make W the subject
The answers I got were wrong according to the teacher, so what do you make the correct answers?
Last edited by FX02; 22 February 2012 at 09:06 AM.
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22 February 2012, 09:13 AM
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Didn't need to show workings for that one!!
Sorry - I know some people struggle like hell with Maths (ask Mrs StiX....!) but as an ex-maths teacher and current IT lecturer, it doesn't get much easier than this
Sorry - I know some people struggle like hell with Maths (ask Mrs StiX....!) but as an ex-maths teacher and current IT lecturer, it doesn't get much easier than this
22 February 2012, 09:15 AM
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Thanks stiX and ANT.
This was part of a project that my son has been working on at school. I helped him out with some of it and he came up with the same answer as you two. he didn't show the workings, so maybe the teacher marked it as incorrect for that.
He simply put R=V/T & W=S/V.
This was part of a project that my son has been working on at school. I helped him out with some of it and he came up with the same answer as you two. he didn't show the workings, so maybe the teacher marked it as incorrect for that.
He simply put R=V/T & W=S/V.
22 February 2012, 09:24 AM
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Thanks stiX and ANT.
This was part of a project that my son has been working on at school. I helped him out with some of it and he came up with the same answer as you two. he didn't show the workings, so maybe the teacher marked it as incorrect for that.
He simply put R=V/T & W=S/V.
This was part of a project that my son has been working on at school. I helped him out with some of it and he came up with the same answer as you two. he didn't show the workings, so maybe the teacher marked it as incorrect for that.
He simply put R=V/T & W=S/V.
Hope this helps, or even makes sense!
22 February 2012, 09:40 AM
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You can make a triangle to make transposition easy. Eg. if you have a=b x c then draw a triangle with one 'compartment on the top half and divide the bottom half into two 'compartments'. In this case, a would go in the top, b and c would go in the bottom. You can then work out the various permutations by covering the required answer, eg. cover c and you have a over b, or a/b, giving you c=a/b.
Hope this helps, or even makes sense!
Hope this helps, or even makes sense!
He had one transposition question with Qsquared (cant put a little 2 in) in. That put a spanner in the works !!! It's been years since I did maths at school and the way it's taught now along with how they expect it to be presented creates lots of wasted paper and ink for my printer
22 February 2012, 09:47 AM
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That does make sense. Thanks Myles.
He had one transposition question with Qsquared (cant put a little 2 in) in. That put a spanner in the works !!! It's been years since I did maths at school and the way it's taught now along with how they expect it to be presented creates lots of wasted paper and ink for my printer
He had one transposition question with Qsquared (cant put a little 2 in) in. That put a spanner in the works !!! It's been years since I did maths at school and the way it's taught now along with how they expect it to be presented creates lots of wasted paper and ink for my printer
This-> http://calcscience.uwe.ac.uk/w2/sg/s..._rearreqns.htm
might help. I might even have a look myself!
22 February 2012, 11:04 AM
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Thanks stiX and ANT.
This was part of a project that my son has been working on at school. I helped him out with some of it and he came up with the same answer as you two. he didn't show the workings, so maybe the teacher marked it as incorrect for that.
He simply put R=V/T & W=S/V.
This was part of a project that my son has been working on at school. I helped him out with some of it and he came up with the same answer as you two. he didn't show the workings, so maybe the teacher marked it as incorrect for that.
He simply put R=V/T & W=S/V.
Dave
22 February 2012, 12:26 PM
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He shouldn't have lost marks for not artificially adding an extra stage.
V=TR to
R=V/T is one step!
You shouldn't have to state 'Divide both sides by T' FFS.
The way some Maths teachers teach pisses me off, had this loads of times with my kids being taught (or not taught) some weirdly ****e methods.
With the Q^2 (Q squared) e.g., if it's just transposing a formula it stays at Q^2.
If you are solving for Q you square root the other side:
e.g.
Q^2=64
Q=sqrt(64)
Q=8
V=TR to
R=V/T is one step!
You shouldn't have to state 'Divide both sides by T' FFS.
The way some Maths teachers teach pisses me off, had this loads of times with my kids being taught (or not taught) some weirdly ****e methods.
With the Q^2 (Q squared) e.g., if it's just transposing a formula it stays at Q^2.
If you are solving for Q you square root the other side:
e.g.
Q^2=64
Q=sqrt(64)
Q=8
Last edited by StiX; 22 February 2012 at 04:48 PM.
22 February 2012, 01:11 PM
#18
He shouldn't have lost marks for not artificially adding an extra stage.
V=TR to
R=V/T is one step!
You shouldn't have to state 'Divide both sides by T' FFS.
They way some Maths teachers teach pissed me off, had this loads of times with my kids being taught (or not taught) some weirdly ****e methods.
With the Q^2 (Q squared) e.g., if it's just transposing a formula it stays at Q^2.
If you are solving for Q you square root the other side:
e.g.
Q^2=64
Q=sqrt(64)
Q=8
V=TR to
R=V/T is one step!
You shouldn't have to state 'Divide both sides by T' FFS.
They way some Maths teachers teach pissed me off, had this loads of times with my kids being taught (or not taught) some weirdly ****e methods.
With the Q^2 (Q squared) e.g., if it's just transposing a formula it stays at Q^2.
If you are solving for Q you square root the other side:
e.g.
Q^2=64
Q=sqrt(64)
Q=8
"Change side, change sign" was enough for us, with + and - being interchangeable, and x and / being interchangeable.
Also roots and powers.
22 February 2012, 01:29 PM
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Originally Posted by ant
v=t x r
v=t/t x r/t
V/T=R
v=t/t x r/t
V/T=R
V/T = (T x R)/T i.e. divide both sides by T. Brackets not necessary as x and / are commutative.
V/T = T/T x R T/T = 1
V/T = 1 x R
V/T = R
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