Step 1: All the values of M given go from 98 (lowest) to 993 (highest)
Step 2: Let's find the smallest power of 10 that will exceed 993, that is the highest value for M
[tex]10^{1\text{ }}=\text{ 10 not higer than 993, }10^2=\text{ 100 not higher than 993}[/tex]Let's continue, this way:
[tex]10^3=\text{ 1,000, correct this is the smallest power of 10 that exceeds M}[/tex]