Bill Shillito
@solidangles.bsky.social
Math instructor at Oglethorpe University. Views my own. Talk to me about anything combinatorial game theory related!
He/him. Pronounced SHILL-lit-toe.
Websites: https://www.solidangl.es, https://1dividedby0.com
He/him. Pronounced SHILL-lit-toe.
Websites: https://www.solidangl.es, https://1dividedby0.com
As my contribution to sharing subtraction strategies, here's how I do subtraction nowadays, using negative numbers!
Made this up on the fly way back when I first started tutoring because I couldn't remember how to do multiple borrowing anymore and I never liked the lie of "you can't take 3 from 2".
Made this up on the fly way back when I first started tutoring because I couldn't remember how to do multiple borrowing anymore and I never liked the lie of "you can't take 3 from 2".
January 2, 2026 at 7:06 PM
As my contribution to sharing subtraction strategies, here's how I do subtraction nowadays, using negative numbers!
Made this up on the fly way back when I first started tutoring because I couldn't remember how to do multiple borrowing anymore and I never liked the lie of "you can't take 3 from 2".
Made this up on the fly way back when I first started tutoring because I couldn't remember how to do multiple borrowing anymore and I never liked the lie of "you can't take 3 from 2".