6 times
No. It depends on how good you are at arithmetic.
-423
6
The number 9 is the greatest one-digit number.
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2
4
No. It depends on how good you are at arithmetic.
-2
-423
99x9999=989901
2
999 x 9 = 8991
2
Zero. I would not both er with regrouping.
1
The greatest six-digit number is 199,999.