Insights into the world of “broken math”
My wife is a certified math teacher, and I am a web developer by trade. Initially this statement seems rather bland and not out of the ordinary. But when I say the result of this combination is: “I subtract when I add,” people tend to look at me funny, first and foremost my wife!
1 + 1 = 2, that part doesn't change, what does change is when you cross a power of 10. For example, most people would look at the problem: 6 + 7 and count up on their fingers (or in their head) from seven, (8, 9, 10, etc…) ending up with 13. I don’t.
When I see this problem, I think 7 is 3 less than 10 so 6 – 3 = 13.
Welcome to the world of “broken math.” Broken math is math that works, but they don’t teach it to you in school. These are the shortcuts that we create in our minds using mathematic principles in a non-standard way to get the correct answer. Here is another example: