The answer is 400 but these websites on related links are good.
9000
10000000
100
To round 0.874 to 1 significant figure, we focus on the first digit, which is 8. The next digit (7) is greater than 5, so we round up. Therefore, 0.874 rounded to 1 significant figure is 0.9.
It is 0 0.00005
It's already there.
7000
2,000,000
9000
0.1
It is 0.01
10000000
0.9
12
800
100
200