Calculator not Passing

Hie, in need of your help campers. calculator seems to be working but failing the test. Where am i missing guys. Thanks in advance. Here is the link https://codepen.io/michaelnkomo/pen/rNBEQwW

Test #10

As you can see you are able to enter multiple zeros.

Test #12/13

Try entering 5 * 5.5 can you see the issue?

Test #16

I have no idea what that error is.

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