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.
What are the rules for writing numbers? 1. Write out numbers one through nine. Examples: one, two, three, four, five, six, seven, eight, nine. 2. Use figures for numbers 10 and above. Examples: 10 proposals, 25 persons, 32 points. 3. In a series of numbers, some of which are above nine and others below, write all the numbers as figures. Example: We received 25 computers, 4 printers, and 65 instruction manuals. 4. Do not write numbers of a million or more as figures. For large round numbers, use words. three million, twelve billion. For large mixed numbers, use a figure-plus-word combination: 12.8 billion, 23.2 million. 5. Numbers that start a sentence are always written as words. Example: Three hundred twenty-one calls came in today. 6. Use a hyphen in fractions used either as nouns or modifiers.