Mandy Jane's Corner

mandy jane · 2013-04-22 02:40:45

I have 1/3= 6/18 but can't get 5/6 = /18 can you help me out?

SteveB · 2013-04-22 02:46:02

The answer to that bit is (15 / 18)

You needed to do 5 x 3 = 15 for the top part. (Also note that 6 x 3 = 18)

mandy jane · 2013-04-22 02:48:01

So is the answer 21/18 am I right?

SteveB · 2013-04-22 02:50:55

Yes now in the question I said that there are two ways you can finish the question off.

(a) A top heavy fraction. (For this you just need to cancel it into its lowest terms, but it is already top heavy in fact.)
(b) A mixed number or a number followed by a fraction as I put it. (Can you see what this is ?)

Hint for (a) divide top and bottom by 3
Hint for (b) take away the whole number one, and present as 1 and a fraction.

Last edited by SteveB (2013-04-22 02:54:18)

mandy jane · 2013-04-22 02:54:41

Ok I will try to finish this for you tomorrow and try to do some of the others as well ok? Hope this is okay with you? So see you at 2.00pm tomorrow ok?

SteveB · 2013-04-22 02:56:17

Last edited by SteveB (2013-05-10 05:03:01)

SteveB · 2013-04-30 07:59:51

I have thought of a good illustration for the adding of (1/3) + (5/6) = (2/6) + (5/6) = (7/6)
or alternatively (1/3) + (5/6) = (6/18) + (15/18) = (21/18) = (7/6)

Both are the same calculation, but with different denominators. (6 and 18 respectively)

Last edited by SteveB (2013-05-10 04:39:35)

SteveB · 2013-04-30 08:05:54

The image to illustrate the above post should be in this post. I have noticed that you cannot type in any Latex in the same
post as an image upload.

Note that the top left and top right illustrations both represent the fractions (1/3) = (2/6) = (6/18)
The middle two represent (5/6) = (15/18)
The lowest two represent the answer to the addition: (21/18) = (7/6) [As a mixed number this is 1 and a sixth see Latex in above post.]

Question to Mandy: Have you understood this illustration ? Do you have any questions about it ?

Last edited by SteveB (2013-05-10 05:03:26)

SteveB · 2013-05-16 02:36:19

To Mandy: Hi SteveB here.

Send email or post reply please ?

It would be a good idea for you to give me an indication of what you think you would like to do next.
Some good ideas might be:
(1) Continue with those 10 questions from the point that you have got to.
(2) Do more on fraction addition.
(3) Ratio
(4) Percentages
(5) Time. Be more specific because a huge number of maths questions use time in different ways and levels of difficulty.

Last edited by SteveB (2013-05-17 01:51:05)

mandy jane · 2013-05-17 02:28:09

Hi steveb mandy here could you send me some questions on fractions and percentage please so I can do them for you by tomorrow ok?

SteveB · 2013-05-17 02:29:53

Okay I can do that. Before I do. There were a few percentage questions in the original 10.
Do you want some extra ones to those? Were the ones I gave you too difficult ?

mandy jane · 2013-05-17 02:33:30

Could I have some more as well as them please and could you send me some questions to try to do on something different please?

SteveB · 2013-05-17 02:34:29

Okay. I will think up some ideas and send you an email.

mandy jane · 2013-05-17 02:37:13

Ok what for email from you ok?

mandy jane · 2013-05-17 02:38:17

Mandy jane here anyone else out there that know me then send me a message please?

SteveB · 2013-05-21 02:29:06

Mandy: I have decided to post the first of those questions that I gave you on Friday:
(Q1)

Last edited by SteveB (2013-05-21 02:47:05)

mandy jane · 2013-05-21 02:52:55

Hi steveb mandy here can you show me how to do this again please,please ihave forgot how to do them?

SteveB · 2013-05-21 02:56:04

With this one I would make sure that the denominators are the same first (the denominator is the number under the line).
So since the denominators are 4 and 5, it is best to multiply them.
This gives us 20.

To get the denominator to be 20, we have to multiply both numerator and denominator to make it this amount.
If you don't do this they will no longer represent the same amount mathematically.

Last edited by SteveB (2013-05-21 02:56:24)

SteveB · 2013-05-21 02:59:04

Now that the denominators are the same the addition is easy:

The second one was:

Do you want to have a go at this one yourself ?

Last edited by SteveB (2013-05-21 03:02:29)

mandy jane · 2013-05-21 03:03:27

Is the answer 2/21 or not?

SteveB · 2013-05-21 03:06:08

The choice of denominator of 21 is okay.
However the fraction (2/21) is not correct.
Let's look first at the fraction (2/7).
In order to make this stay the same the numerator has to go up by the same factor (or multiple).
This will need you to multiply top and bottom by 3. Try again ?

EDIT: Be careful not to confuse multiplication of fractions with addition.

Last edited by SteveB (2013-06-19 02:38:43)

mandy jane · 2013-05-21 03:08:46

3x2=7 7x7=14 am I right?

mandy jane · 2013-05-21 03:10:15

2x3=6 3x7=21 am I right?

SteveB · 2013-05-21 03:10:19

The second attempt, which I originally did not see because I was writing my post at the same time as yours, was correct.
2 x 3 = 6
7 x 3 = 21

So (2/7) = (6/21)

The next step is to do something similar to the fraction: (1/3)

Last edited by SteveB (2013-06-19 02:37:08)

mandy jane · 2013-05-21 03:13:32

Ok I will do this and send it to you later today or tomorrow ok she new puppy is playing me up at the moment if ok with you?

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