Question

Write 7/100 as a decimal?

Answer 1

7/100 is "seven hundredths” (it always helps to say it out loud)
From that information, you know that the 7 will be in the hundredths place. 
The second spot after the decimal is the hundredths place, so the 7 goes there.
0.07 is your answer.

Answer 2

0.07 is the answer. All you need to do is divide the 7 by 100 and bam!