grammaticality - Divide two into four and Divide two by four


Why does "divide two into four" equal two, and "divide two by four" equal one half?


Correct if I am wrong, but this what I have learned recently.



Answer



OP's confusion arises because "divide 2 into 4" is an idiomatic usage meaning perform a division operation, using 2 as the divisor, and 4 as the dividend.



symbolically...
4/2 = 2


clearest verbal form...
divide 4 by 2, giving the answer 2


idiomatic alternative...
divide 2 into 4, giving the answer 2



It's not the same usage as dividing a pizza into 4 [pieces], where you'd probably get 1/4 (a quarter) of a pizza as your share!


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