36
Remember that in decimal division, the decimal point moves the same way in both numerator and denominator. 0.018 ÷ 0.0005 = 0.18 ÷ 0.005 = 1.8 ÷ 0.05 = 18 ÷ 0.5. Notice that 0.5 = 1/2 is the reciprocal of 2, so dividing by 0.5 is equal to multiplying by 2. Thus, 0.018 ÷ 0.0005 = 0.18 ÷ 0.005 = 1.8 ÷ 0.05 = 18 ÷ 0.5 = 18 × 2 = 36.