Two significant figures (3,4).
Two of them.
No, 340 has two significant figures.
340
340
10 of them.
Two. The zero is just a placeholder.
231.57 has five significant figures/numbers. All the numbers in 231.57 are significant.
170 + 170 = 340
NO. the prime numbers of 340: 2x2x5x17
The figure 18.03 has a total of four significant numbers
Three. All nonzero numbers are significant, and any zeros in between significant numbers are significant.
340