The first significant number is 6 but since the next number is over 5, we round the 6 up so it becomes 7000
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975 rounded to 1 significant number is 1,000
10,00010,00010,00010,000
4000 has between 1 and 4 significant figures: if it is a rounded number, then it could have been 3999.9, for example, which would be rounded to 4000 to 1, 2, 3 or 4 significant figures.
54.26 rounded to 1 significant figure is 50
0.00584 rounded off to 1 significant figure is 0.006