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May
8
comment Subtraction when second number is bigger than first number
@David: but how do you know that -2000 + 89 is -1911? You again have to subtract a larger number from a smaller one, using the borrowing method again will give the OP the same "problem" he has had in the first place.
Sep
8
awarded  Supporter
Jan
7
comment Maths without irrational numbers
@MJD: OP is asking about "a consistent mathematical system", not about the universe.
Oct
4
awarded  Teacher
Oct
4
comment How do you find the center of a circle with a pencil and a book?
@robjohn: Ups, you are right. I didn't check the other answers carefully enough. At least I mentioned in the answer the central theorem (Thale's) and the required property of the book (90° corner).
Oct
3
answered How do you find the center of a circle with a pencil and a book?