fall apart = break
break in my hands? sounds weird for me.
"I picked up the calculator and to my surprise it fell apart in my hands"
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"I picked up the calculator and to my surprise it fell apart in my hands"
It's correct. Imagine that you have some object that is made up of several pieces or parts held together by glue or screws, and when you pick it up the glue or screws fail, and the individual pieces separate.