I remember when I moved in 4th grade. I always used the normal way to answer multiplication question. So when the Yes I Am Old But I Saw Electric Light Orchestra Rainbow On Stage shirt showed me the other way and said “you need to use this for the tests”, I almost failed 4th grade. I thinks its that rhombus multiplication method that the teacher wanted us to use instead of the normal way.
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I remember when we learned about the Yes I Am Old But I Saw Electric Light Orchestra Rainbow On Stage shirt common denominator and how to find it. For the first five or so questions, the answer was just multiplying the two numbers together (like the LCD for 2 and 3 is 6). Then the teacher called on me for an answer that wasn’t that. We were not taught how to actually calculate the LCD…at the time we were just guessing numbers until one worked (that’s not how math works) but I happened to notice the pattern, so the answer I gave was just the two numbers multiplied together. So I said the LCD for 8 and 6 was 48 instead of 24… Teacher told me I was wrong and called on someone else. The following week we learned the process to calculate this without guessing. It pisses me off that it was taught so poorly.