Num lock. The Num Lock key exists because earlier 84-key IBM PC keyboards did not have cursor control or arrows separate from the numeric keypad. Most earlier computer keyboards had separate number keys and cursor control keys; however, to reduce cost, IBM chose to combine the two in their early PC keyboards.
The most common rule. The most common and frequently used rule for writing numbers in APA style is determined by whether the number is under 10. All those numbers should be written out in word form, such as four or seven. A number 10 and above is written as a numeral, such as 10, 17, 233.
Numbers are written around the circumference, usually beginning with 0 at the top and increasing as you go around the dial clockwise. Aside from physically breaking into the safe (which is very hard to do), correctly inputting a series of numbers into the combination dial is the only way to open a safe.