Answer:
25.8
258.
2580.
Step-by-step explanation:
just move the decimal that many times
258
2580
10 to the power of 2 is 100
10 to the power of 2 is 1000
10 to the power of 4 is 10000
100 * 0.258
1000 * 0.258
10000 * 0.258
