Multiplying numbers?

Glaucus · 14 Jun 2007 at 21:25

I know you can do the grid method, but is there any easier way to do it in your head?

I know this is simple stuff, but hey..

and |I know the easy way for 11.

Glaucus · 14 Jun 2007 at 21:27

yhack said:
If it's x20 then do x10 then x2 and it's easier, stuff like that makes it a lot faster to work stuff out for me.

yeh I was thinking more in the lines of 12, 13,14,15 ect.

Glaucus · 14 Jun 2007 at 21:30

yhack said:
Sorry, I seemed to miss that part of the first post. It's like it wasn't there.

he-he, I did forget to put it in, I wasn't having a go.

Glaucus · 14 Jun 2007 at 21:32

Jokester said:
Say 13 x 14, I would do 10 x 14 then add 3 x 14.

Jokester

oh yeah baby, why didn't I think of that.
thanks

..

I havent had to do simple maths for a few years. it's so odd.

Glaucus · 14 Jun 2007 at 21:55

Stormrider said:
I still remember having the times tables drilled into me at primary school.
Do they even still teach kids that anymore?

I only got taught up to the 10 times table, then the grid method.

Glaucus · 14 Jun 2007 at 22:11

manoz said:
have no idea what the grid method is. P

not very easy to do in the head.

Glaucus · 14 Jun 2007 at 22:25

manoz said:
Hmm, yeah not so inconvenient in the head. I see where the numbers in the square bits come from and you would just add them up but I don't see what the diagonal lines are for?

you have to add up in a diagonal. excellent for working out any large number easily, but not nice for mental arithmetic.