Gransnet forums


A new way to multiply?

(16 Posts)
Aka Sat 24-May-14 17:50:45

try this for fun

Agus Sat 24-May-14 17:59:02

DH enjoyed this. Sadly.....I am pants at maths

NfkDumpling Sat 24-May-14 17:59:34

I shouldn't have looked - I knew I shouldn't have looked - the new maths is confusing enough - I'll have to do some practice sums now the proper way to reassure myself! confused

Ana Sat 24-May-14 18:23:08

I'm not sure I could ever really trust it - I'd have to do the sum properly just to make sure! Interesting, though.

NannaAnna Sat 24-May-14 19:44:28

Interesting, but it's not any quicker or simpler than just multiplying the usual way … is it??

rosequartz Sat 24-May-14 20:49:48

Yeah!! Love it!

rosequartz Sat 24-May-14 20:53:24

I will refer the above post of mine to the modern expressions thread.

I enjoyed it, although I do not normally enjoy mathematics.

Aka Sat 24-May-14 21:47:39

It is in fact just a new algorithm but fascinating.

rosequartz Sat 24-May-14 22:29:30

I do think it is simpler, if I can remember how to do it when, if ever, I need it.

annodomini Sat 24-May-14 22:37:11

I've sent the link to my mathematical DiL. I'm hoping my 9-year-old GS will be able to explain it to me - he also has a maths gene!

Ana Sat 24-May-14 22:43:32

Simpler? I disagree, an ordinary sum is much simpler to me - and hell of a lot quicker! grin

rosequartz Sat 24-May-14 23:29:48

Our minds work in different ways! It seems much simpler to me to see a diagram than abstract numbers that mean nothing to my brain. Not saying I was absolutely useless at maths, just would never have made a mathematician!

Aka Sun 25-May-14 07:54:22

It's the kind of thing I'd have enjoyed doing with my Y6 class for fun. Not just those who had trouble with long algorithms such as 256 x 521 but also the more able ones to see their faces when they came up with the solution using such a method.

Think I'll try it with my 7-year old GS.

AlieOxon Sun 25-May-14 08:14:16

I tried it and it works - but I can't understand why! And it doesn't seem to cope with a zero?
I found it very cumbersome with bigger numbers.
Think my grandson too might be interested!

janerowena Sun 25-May-14 12:38:38

My OH showed me that a few years ago - he's a head of maths. I asked why we didn't use it more, he said it's too slow and can't cope with very large numbers, but he likes the sheer elegance of it. I think he said it is Japanese.

However, at the time I said that I thought that I was sure that some children would find it easier to understand the whole concept if they saw a demonstration of it, so he does include it in his lessons, along with many other weird and wonderful ways that I had never heard of.

durhamjen Sun 25-May-14 16:37:43

Surely the point is that, if you can already do it easily using a method you were taught, you do not need a new way. But if you have always been confused using the old method you were taught, this might help.
My grandson looked over my shoulder and said it looked good, so I will try him with some next week.
Thanks for the link, Aka.