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 Post subject: simple equationsPosted: Sun Mar 08, 2015 2:02 pm

Joined: Sun Aug 11, 2013 7:59 pm
Posts: 160
hello all, 3t = t + 3

I know the answer is 1.5 , can you get to this answer by trying to work out the letter t ie by doing the same to both sides of the equation to work the answer out or is it a little trial and error with different numbers fot t. thanks in advance to u all, maths not my strong point.

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 Post subject: Re: simple equationsPosted: Sun Mar 08, 2015 2:44 pm

Joined: Thu Mar 14, 2013 6:30 pm
Posts: 583
You got it, letters to one side, numbers on the other.

To get rid of the single t on the rhs, what do you have to do, subtract a t. What is done on one side of the equation has to be done to the other, therefore subtract a t from 3t, this leaves 2t on the lhs. So letters on LGS, only numbers on the rhs.

Good luck

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 Post subject: Re: simple equationsPosted: Sun Mar 08, 2015 2:46 pm

Joined: Sat Aug 10, 2013 11:46 am
Posts: 188
Yes. Take t from both sides so you have 2t=3. Then divide both sides by 2.

May I suggest the following if explaining it to your child:

Draw scales with 3 square boxes marked t on one side of the scales and one a box marked t and 3 small circles on the other.

You are trying to find how many circles each box holds and the scales must always balance.

You can take one box from each side.

You are left with 2 boxes one side and 3 circles on the other side.

You can then divide the circles into 2 equal portions of 1 1/2.

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 Post subject: Re: simple equationsPosted: Sun Mar 08, 2015 2:57 pm

Joined: Sun Aug 11, 2013 7:59 pm
Posts: 160
Thanku both posters, thats made it so much easier.

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 Post subject: Re: simple equationsPosted: Sun Mar 08, 2015 4:51 pm

Joined: Fri Oct 12, 2007 12:42 pm
Posts: 3810
I would teach this pictorially.
Draw a rectangle and write 3t inside, cut rectangle into 3 parts, each part with t
Draw an identical rectangle underneath cut into two parts: one the same as above and write t in that part, write 3 in the other part.
Your child can then clearly see that the 2t parts are the same as the 3 part.

This is the preferred method in UK maths and is also referred to as bar modelling or Singapore strips. I've always taught this way in KS2 and at 11+, which is perhaps why I like it.

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 Post subject: Re: simple equationsPosted: Sun Mar 08, 2015 8:49 pm

Joined: Mon Jun 18, 2007 2:32 pm
Posts: 6963
Location: East Kent
moved wrote:
I would teach this pictorially.
Draw a rectangle and write 3t inside, cut rectangle into 3 parts, each part with t
Draw an identical rectangle underneath cut into two parts: one the same as above and write t in that part, write 3 in the other part.
Your child can then clearly see that the 2t parts are the same as the 3 part.

This is the preferred method in UK maths and is also referred to as bar modelling or Singapore strips. I've always taught this way in KS2 and at 11+, which is perhaps why I like it.

Thanks moved, you've just made my next few days much easier!

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 Post subject: Re: simple equationsPosted: Sun Mar 08, 2015 8:52 pm

Joined: Mon Feb 12, 2007 1:21 pm
Posts: 11934
moved wrote:
I would teach this pictorially.
Draw a rectangle and write 3t inside, cut rectangle into 3 parts, each part with t
Draw an identical rectangle underneath cut into two parts: one the same as above and write t in that part, write 3 in the other part.
Your child can then clearly see that the 2t parts are the same as the 3 part.

This is the preferred method in UK maths and is also referred to as bar modelling or Singapore strips. I've always taught this way in KS2 and at 11+, which is perhaps why I like it.

The bar method is not taught at secondary -

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 Post subject: Re: simple equationsPosted: Sun Mar 08, 2015 10:10 pm

Joined: Thu Mar 14, 2013 6:30 pm
Posts: 583
There are many things that are not taught, but make better sense to my child than modern school methods. Luckily I can still remember and therefore teach the older years methods, it works.

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