10,00010,00010,00010,000
9,990 to 3 s.f., or 9,990 (3 s.f.) or 9,990
9999.00
10000
It is 9999 (if a one is added, it becomes a five digit number: 9999 + 1 = 10,000)
10,00010,00010,00010,000
9,990 to 3 s.f., or 9,990 (3 s.f.) or 9,990
9999 rounded to the nearest tens place is 10,000
10,000
10000
10000
9999 of them.
9999
9999.00
10000
10000
10000