The first example provided by Google is 5+2*2. The Google calculator obeys the rules of operator precedence and understands parentheses: 3*(18-2)-1 correctly evaluates to 47. Sometimes the calculator understands the tacit multiplication operator, but it is best to always state it explicitly. The calculator will sometimes insert parenthesis into the expression to show it has understood correctly, e.g., in response to “$125 + 6% of$125” it answers with “(US$125) + (6% of (US$ 125)) = 132.5 U.S. dollars.” For sufficiently large numbers (for example, powers of two greater than $2^{42}$) it switches to scientific notation. Like most hardware calculators, the Google calculator also responds to 0^0 with 1.