Posted on 08/07/2017 3:48:16 PM PDT by RoosterRedux
Compared to traditional long multiplication, the grid method differs in clearly breaking the multiplication and addition into two steps, and in being less dependent on place value.
Whilst less efficient than the traditional method, grid multiplication is considered to be more reliable, in that children are less likely to make mistakes.
Most pupils will go on to learn the traditional method, once they are comfortable with the grid method; but knowledge of the grid method remains a useful “fall back”, in the event of confusion. It is also argued that since anyone doing a lot of multiplication would nowadays use a pocket calculator, efficiency for its own sake is less important; equally, since this means that most children will use the multiplication algorithm less often, it is useful for them to become familiar with a more explicit (and hence more memorable) method.
Use of the grid method has been standard in mathematics education in primary schools in England and Wales since the introduction of a National Numeracy Strategy with its “numeracy hour” in the 1990s. It can also be found included in various curricula elsewhere. Essentially the same calculation approach, but not necessarily with the explicit grid arrangement, is also known as the partial products algorithm or partial products method.”
For Later. Thanks.
Lol. But, according to the piece I followed up with, I was apparently correct in that it’s not faster than the traditional way.
“Whilst less efficient than the traditional method, grid multiplication is considered to be more reliable, in that children are less likely to make mistakes.”
I thought the same thing. Looks to me like making something simple into something complicated.
Plus this “method” teaches you none of the abstract concepts of numbers. Does the kid understand 32x16 this means 32 added together 16 times? Or vice versa? If you understand what multiplication means then you can learn to do it.
Flash cards are still a very effective way to teach the basic times tables. From there this level of multiplication naturally follows.
BFL
Nice trick. I’ll remember that.
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