Notice the place value of the decimal point.

What can you divide $7$ by to get $0.007$?

When you divide any number by $10, 100, 1000,$ etc., the decimal point moves to the left according to the number of zeros in the divisor.

$\frac{7}{1000}$

Use the same method as in part (a).

$\frac{103}{1000}$

Notice that 1.21 has a decimal point two decimal places to the left. Two decimal places refers to the hundredths place.

$\frac{121}{100}$

You can conclude from parts (a) and (c) that dividing by a number consisting of multiple zeros moves the decimal left a number of times equal to the amount of zeros.

$0.505$

Notice that the number $100$ has two zeros.

How many zeros does the denominator have? How many times and in which direction should the decimal point move?