When you divide by a fraction, you end up multiplying by the reciprocal:
3/4 ÷ 1/2 = 3/4 • 2/1
Now that it’s multiplication, you multiply straight across.
3•2 / 4•1 = 6/4
Then remember to reduce. Since both 6 and 4 are divisible by 2, divide both by 2.
6/4 = 3/2