My New Vocabulary for Today : Part 58

Hi, I'm trying to make some sentences using the new vocabulary I learnt today.
If there are any grammar mistakes and/or weird word choices, please correct them. Thanks.

1) Five multiplied by two is ten. (Not incorrect but makes is more natural and equals is more formal.)

2) Ten divided by two is five. (ditto)

3) The earthenware pot is filling up or being filled with water drop by drop.

4) That is a succession of step by step drops from the beginning. (Not sure what this is talking about.)

5) ["Something"], he said with his (usually a) sluggish and dull voice. (His voice is ok if this guy's voice is always sluggish and dull.)

6) He smirks (a lot) and (often) makes long-winded interrogations. 

7) I'm going to have to move, regardless of whether or not I have sorted all my stuff out.

8) I accept your challenge on one condition. Give me a/one convincing reason.

9) We deviated from the original topic of conversation when a label (?) (suddenly) fell off the wall.

10) Tell me when you come up with a great idea no matter what (it is or how crazy it seems).