To divide 48.6 by 0.15, Kenji should eliminate the decimal from the divisor (0.15) to make the calculation simpler. The best way to do that is to multiply both the divisor (0.15) and the dividend (48.6) by 100. This will convert 0.15 to 15 and 48.6 to 4860.
Therefore, the first step Kenji must complete is:
Multiply the divisor and dividend by 100.