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Answer
0.04 x 75 == 0.75 x 4 == 75 x 4 x 0.01
switch the order of the last two terms (the second equality), put the 0.01 in the middle, and it makes a bit more sense when read as calculation steps.
0.04 * 75 = 4 * 0.01 * 75 = 4 * 0.75That’s fair. I intended them to just be a list of equalities
I’d do 4%=1/25, 75/25=3.
Even the first one, 0.75 doubled and then doubled again is hard?
Ya
Why did no one ever teach me this?? Did I miss this day in class? I feel so silly. This is really useful.
Most teachers will write it off as obvious. Taking a percentage of something is just multiplication and if you actually write it down with multiplication, it is, indeed, obvious:
4*75/100=75*4/100And yes, it means you can just multiply 75 by 4 first and then divide by 100.
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75% = 3/4
(3/4) * 4 = 3
I also remember a somewhat sinister question: Using a knife, divide 3 apples among 4 people with the less possible cuts. 💀
Is that the one that goes: cut one person, give the three survivors an apple each?
Asian Superman knows this
The way I see it it makes simple sense:
X% of Y = X * Y/100
Y% of X = Y * X/100
As we know there is no significance to the order here so it is easy to see why they are equal.
639% of 1282.5
This only works in small cases.
4% is 4 in a hundred
75 is 3/4 of a hundred
4% of 75 is 3
