Fred G. Harwood
@harmath
Maths teacher, mentor teacher, ed consultant fascinated with discovery learning and inquiry, problem solving, assessment, visualization & making a difference.
ID: 56564844
https://harmath.wordpress.com/ 14-07-2009 01:36:39
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#MathStratChat Pam Harris For subtraction, I really like shifting equally. Here I'd do two moves to make it simpler. 7 less and 500 more: 6015 – 3507 = 6008 – 3500 = 6508 – 4000 = 2508