1 significant figure.
There are two of them.
It is 9680
8.30 x 10^4
5.003 has 4 significant figures.
990 has three significant figures.
Those four numbers are all whole numbers.
The numbers are 9, 10 and 11.
231.57 has five significant figures/numbers. All the numbers in 231.57 are significant.
900 of them.
990, 000
It then is 990
The figure 18.03 has a total of four significant numbers
There are 99 tens in 990.
Three. All nonzero numbers are significant, and any zeros in between significant numbers are significant.
There are 49 3-digit numbers - from 108 to 990 inclusive.
Because 10.00400 is 10.004, this has five significant digits (numbers).