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One is certain and the other in uncertain.
At most 1.
if I understand your question, the smallest six-digit number is 100 000. Perchance it is also even. And here I'm uncertain of your wording - but: - And it is two times fifty thousand.
490 to 2 s.f. Note that when the significance is uncertain, you must specify it (s.f. is an abbreviation of significant figures). You can also underline the last significant digit: 490
The word uncertain has three syllables. The syllables of the word are un-cer-tain.