Five of them.
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to 1 significant digit: 8000 2 significant digits: 7700 3 significant digits: 7660 4 significant digits: 7656. 5 significant digits: 7656.0 6 significant digits: 7656.00 and so on and so forth for forever..........
2.99 rounded to three significant digits is 2.96 2.99 rounded to two significant digits is 3.0
5.003 has 4 significant figures.
3 of them.
2 of them.