Showing posts with label directed number multiplication. Show all posts
Showing posts with label directed number multiplication. Show all posts
Friday, 17 April 2020
Saturday, 17 February 2018
Saturday, 3 February 2018
Tuesday, 4 June 2013
multiplying directed numbers
using a grid can establish some rationale for the multiplication of two negative numbers being a positive number
this approach was suggested to me by Gill Hatch, when she was at Manchester Metropolitan University
a powerpoint goes through the solution steps
but it's probably better developed with student suggestions
firstly, using some examples of numbers that sum to 5 (down) times two numbers adding up to 6 (across)
establish that the result of adding the four boxes must be 30
eventually there may be a suggestion that involves two negatives (as in the 4th one)
knowing that the overall total must be 30 identifies the bottom right hand product needed to make this total
this approach was suggested to me by Gill Hatch, when she was at Manchester Metropolitan University
a powerpoint goes through the solution steps
but it's probably better developed with student suggestions
establish that the result of adding the four boxes must be 30
knowing that the overall total must be 30 identifies the bottom right hand product needed to make this total
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