## Another Math problem

(31 posts)
• Started 4 years ago by Drizzle
• Topic Viewed 832 times

Drizzle
Posts: 2045

I want to multiply 46x 25 ok so it equals Total 1150.

Now to make it easier for mental working..
Multiply 40 x 20 = 800
6 x 5 = 30 ... Total 830.

Can someone explain why the difference in answers...I am going round in circles :)

Posted 4 years ago

Scott
Posts: 5618

nope, nope not equal to ≠

Posted 4 years ago

moreeg
Posts: 842

It's a case of cross multiplication as in

46*25 =

(40+6)*(20+5) =

(40*20)+(40*5)+(6*20)+(6*5) this is the cross multiplication (had to dredge this up from long. long, long ago).

Posted 4 years ago

Scott
Posts: 5618

It may be the meds talking, I defer to Moree.

Posted 4 years ago

moreeg
Posts: 842

Don't knock the meds - they keep many of us going😎

Posted 4 years ago

Scott
Posts: 5618

I'm not knocking and I sure as hay ain't blocking.
Math is tertiary to neck surgery :)

Posted 4 years ago

Lighthouse
Posts: 13598

Just be thankful you are not a giraffe Scott.

Posted 4 years ago

Scott
Posts: 5618

That is how I felt, like a sad giraffe.
A sad giraffe with math problem is worse though.

Posted 4 years ago

vistamike
Posts: 10945

A sad giraffe with math problem is worse though.

I wouldn't stick my neck out on that one................................

Posted 4 years ago

Lighthouse
Posts: 13598

Says Mike the tortoise :)

Posted 4 years ago

Ted16
Posts: 1952

Do they call a sad Math Giraffe An Algebrath.

Kate if I were working that out in my head it would be,

40 X 25 = 1000
6 X 25 = 150

Interesting conundrum though so hats off to moreeg for providing the answer and to stop you feeling Cross :)

Ted

Posted 4 years ago

Scott
Posts: 5618

Algebrath = Algebraffe

Posted 4 years ago

Ted16
Posts: 1952

That works better Scott. :)

Ted

Posted 4 years ago

Lighthouse
Posts: 13598

Algaebreath !

Posted 4 years ago

Ted16
Posts: 1952

Try Listerine :) Nice one LH.

Ted

Posted 4 years ago

Lighthouse
Posts: 13598

What's a diatom or two between friends :)

Posted 4 years ago

Scott
Posts: 5618
Posted 4 years ago

Lighthouse
Posts: 13598

LOL. And nice to see a bit of resistance in there :)

Posted 4 years ago

Drizzle
Posts: 2045

LOL!!! I thought you would all enjoy ....... thanks for all the replies..

Hey!!! Scott... Good to see you posting with your usual sense of humour, not easy after your Op last week end..
Really hope the Neck is moving easier and you can reduce the dreaded Pain Killers...

Posted 4 years ago

Scott
Posts: 5618

Hello kate and thank you again for all your well wishes these last few weeks.
The bad meds are being tapered, won't be using them much longer.

Having had to be re-admitted for post-op issues was no fun indeed.
I think we're done for overnight stays, at least we better be.

Posted 4 years ago

Straspey
Posts: 556

And then, of course, there's everybody's favorite...

Posted 4 years ago

Lighthouse
Posts: 13598

Everyone knows that X marks the spot. Start digging :)

Posted 4 years ago

Ted16
Posts: 1952

Here :)

Posted 4 years ago

Lighthouse
Posts: 13598

What's that sea monster doing onshore ?

Posted 4 years ago

moreeg
Posts: 842

back to the original question - if the objective is an easier way to mentally calculate this particular problem you can try

46/4 = 11.5 *100 = 1150

this takes advantage of the fact that 25 is 1/4 of 100.

And Scott, I didn't know you had just had surgery - didn't mean to make light of the need for meds.

Posted 4 years ago

Scott
Posts: 5618

@ Moreeg, no worries and no secrets with me. I had some complicated fusion surgery but hopefully upward and onward now.

The fusion has had some mixed consequences. I have a sudden urge for Kee Mao noodles with masala and Beff Wellington curried empanadas.

Posted 4 years ago

moreeg
Posts: 842

Could be you're pregnant. Exactly what kind of meds are you getting?

Posted 4 years ago

Scott
Posts: 5618

Rephrased, the question becomes exactly what kind of meds am I *not* getting?

Pregnant, no. Steriods, yes, for instance.

Posted 4 years ago

Drizzle
Posts: 2045

@moreeg..
Grandson was saying at school they tell him to break down into 10's..
Hence my original of OK 40x20 and then the 6x5 Theory.... so whilst I see the explanation. I still Cannot explain WHY the 40x20 etc does not add up...

My old grey matter not so quick these days, Like Ted says there are easier ways and conundrums,
Probably best to stay with the young of today 'Do NOT ASK, just use the calculator Ha!!!!!!'

Posted 4 years ago

Ted16
Posts: 1952

Kate I help out with reading & math each week at my local primary school. The way they teach them to multiply baffles me. Then there are number lines etc.
I still think my generation were taught the best way. IE the forties & fifties in my case.

Scott I also did not know about your op so I wish you well for a good recovery. Sounds complicated. I also suffer with my neck having sudden spells of dizziness and occasional episodes where I almost black out. This all due to a problem in the neck pressing on the blood flow. Sadly they refuse to carry out an op as considered too dangerous so I live with it.

Ted

Posted 4 years ago

Scott
Posts: 5618

Ted I hope you can find some relief, even if its an epidural or the like.
Passing out when your not even a freshman at Cambridge? There's no time for that.

Posted 4 years ago

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