I cross blades, but with no adversary.

I am sharp, but I am still entrusted to children without thought.

I turn one into two, two into four. But never vice-versa.

Who am I?


The Answer:



Blades cross paths to cut.
Cuts things up, which divides them.

  • 1
    $\begingroup$ DESPERATELY TYPED THE ANSWER, KNEW OTHERS WOULD GET IT QUICK $\endgroup$ – Daedric Jan 22 '16 at 2:40
  • $\begingroup$ Why could it not go the other way? (4)x(½)=2. This is a good solution, but not the one I am looking for. $\endgroup$ – Quiquȅ Jan 22 '16 at 2:44
  • $\begingroup$ Is it the addition? $\endgroup$ – Daedric Jan 22 '16 at 2:45
  • $\begingroup$ Another good idea, but I'm not thinking within the realm of mathematics. I will add another line if I need to. $\endgroup$ – Quiquȅ Jan 22 '16 at 2:47
  • $\begingroup$ @HankoTanks Seems too broad then... $\endgroup$ – Daedric Jan 22 '16 at 2:49

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