If you'd like to go even faster, there's a 30 Second variant also!
I've also come to the realization that "old people" aren't old people. They're young people that time happened to.
Everyone is using rounding (which may be quicker) but I always do short division in my head. See how many times it goes into the first number (or numbers depending how many places), find remainder, add in front of last number and you have your answer. Easier than finding a rough and guessing more
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