Answer
40
Work Step by Step
36$\div$0.9
Move the decimal in 0.9 one place to the right to make it a whole number (9). To accommodate for this, add one zero to 36 (360).
360$\div$9
Use long division to divide this, and the answer will be 40.
Alternatively, notice that 36$\div$9 = 4, and that 360 = 36 * 10, so 360$\div$9 = 4 * 10 = 40.
