What is multiplication by partitioning?

[souldriver]

My daughter has come home with some maths home work which involves multiplication by partitioning. Shes only 7 and she says she doesnt know what it is? I'm assuming they have done it in the class room or why would she be given it as home work. Its upsetting her because she doesn't want to get in trouble off the teacher. I just need to know what it is so i can help her through it, its a long time since i was at school and i havent got a clue, thanks.

[kira000]

This is a game based on multiplication by partitioning. I.e by splitting the numbers.

Hope it helps!

http://www.bbc.co.uk/skillswise/numbers/wholen umbers/multiplication/written/flash2.shtml

[TCL-MUMPING]

It just means splitting numbers to make the calculating a wee bit easier. For example,

15 x 18 is the same as (10 + 5) x (10 +8) and that can be written as (10 x 10) + (10 x 8) + (5 x 10) + (5 x 8) or

100 + 80 + 50 +40 = 270

More examples can be found here, http://www.bbc.co.uk/skillswise/numbers/wholen umbers/multiplication/written/flash2.shtml

[TCL-MUMPING]

Great minds etc....

[souldriver]

cheers guys

[sophie_1003]

A really good method for this is the grid method-
www.chevening.kent.sch.uk/qpages/downloads/pp/TheGridMethodOAandHM.ppt -
this gives a tutorial on it. I find this way helps me keep track of which numbers I've dealt with! With regards to your daughter not knowing what partitioning is they should (like you said) have done it in the class but they should also be very comfortable with how to partition before being given any work on using it in multiplication. Maybe ask the teacher if they could explain partitioning again to your daughter.

[sophie_1003]

sorry, the link didnt work but type grid method into google and it should be the first one to come up, it's a powerpoint document

[kakaduka]

Hello, I think that you want to get more info about it. Go to http://asdurben.blogspot.com/?q=forex

[squarebear]

Do not click this user's links. They lead to spam sites and have nothing to do with the question.

[sunflower68]

also called the "chunking method"

[sophie_1003]

my links aren't meant to lead to spam!! was actually trying to help :o(

[Naomicorlett]

Ah Sophie. I know you were trying to help. I googled grid method and spent a happy half hour playing with numbers. A very elegant way of long multiplication and thank you for showing me it. Naomicorlett.