Hi Gemma,
Correct formula, but there's no need to set the precision of either D2 or E2. Setting the number of decimal places affects only what is displayed in those cells. It does not change the actual values.
Here are two alternate formulas that achieve the same result: the number of whole shares that can be purchased using a specified amount, and given a set price:
A: =INT(E2/D2)
B: =TRUNC(E2/D2,0) note: the 0 is optional. It sets the place, relative to the decimal point, to which the number is truncated.
C: ROUNDDOWN(E2/D2,0) note: Parentheses around E2/D2 are not necessary. ROUNDOWN does require the zero.
F: =E2/D2 (This returns the full result of the diviion, in this case a repeating decimal)

Cells in row 2 are set to Number, 2 decimal places. Cells in row 3 are set to Automatic. The header row indicates the formula used in each column.
Regards,
Barry