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None. You could write is as 1,000 kilowatt and have 3 0s or 1,000,000 watts (6 0s) or 1,000,000,000 milliwatts (9 0s) etc.
3,000,000*1,000,000=3,000,000,000,000. Why? An easy way to do it is to take away the 0s, multiply, and then add on the total number of 0s later. Take away the 0s in this expression, evaluate 3*1, which is 3, then add on the 12 0s. After all is done, you get 3,000,000,000,000. Other related questions- What is 3,000,000x1,000,000,000,000?
12
none.
If leading 0s are disallowed, only 27 of them. If leading 0s are allowed then 378.