You can find it North and south hope this helped :)
1/243
each second number is being multiplied by three
3*3=9
9*3=27
27*3=81
so 81*3=243
243 is the answer
<span>The basic arithmetic operations are addition, subtraction, multiplication and division, the subject also includes more advanced operations, such as manipulations of percentages, square roots, exponentiation, and logarithmic functions.</span>