number Bank account arithmetic
Use this to teach directed numbers to adult students...
-8 means overdraft of 8
-6 - 9 = -15 Story: "You are 6 pounds overdrawn and then spend another £9"
15 - 25 = -10 Story: "You have £15 balance but spend £25"
The next one is a bit trickier
10 -- 7 = 17 Story: "The bank cancelled a debit of £7, so you are £7 better off..."
Robert Powell is an educational guru (quite an occupation these days) whose Web site mainly lists things you can buy. He does give quite a nice summary-cum-checklist.
I think this strategy fits under his "Start from the familiar - use prior knowledge". After the basic manipulations are in place, I do number lines (for the visual thinkers) and even talk about inverse operations and why -1 x -1 might need to be +1.
Originally added on Thursday, March 18, 04
in category: number
Use this form to send a comment about this resource. When you send your comment by clicking on the 'Send' button, you will be returned to this page.
[ top ]Content by Keith Burnett and contributors
Powered by Movable Type 2.63