How do you quarter a number with a calculator?

To "quarter" anything, you divide it into four parts (often 4 roughly equal parts).

So on a calculator, you simply enter the number, hit the "divide by" key (either a / or a ÷ sign), hit the number 4, and hit = (equal, enter, execute).

You can also divide by 4 by multiplying by 1/4, which on a calculator is done by multiplying your number by 0.25 (decimal point, two, five).

(the / key is often called a right slant or slash, while the ÷ sign is called an obelus)