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A numeric keypad, number pad, numpad, or ten key,〔 (【引用サイトリンク】 What Is a Ten Key? (with pictures) ) 〕〔 〕〔 〕 is the palm-sized, 17-key section of a standard computer keyboard, usually on the far right. It provides calculator-style efficiency for entering numbers. The numpad's keys are digits 0 to 9, addition (+), subtraction (-), multiplication ( *) and division (/) symbols, a decimal point (.), Num Lock, and Enter〔''(numeric keypad )'' at FOLDOC〕 Laptop keyboards often do not have a numpad, but may provide numpad input by holding a modifier key (typically labelled "Fn") and operating keys on the standard keyboard. Particularly large laptops (typically those with a 17 inch screen or larger) may have space for a real numpad, and many companies sell separate numpads which connect to the host laptop by a USB connection (many of these also add an additional spacebar off to the side of the zero where the thumb is located, as well as an additional 00 key typical of modern adding machines and cash registers). Numeric keypads usually operate in two modes. When Num Lock is off, keys 8, 6, 2, and 4 act like arrow/navigation keys up, right, down, and left; and 7, 9, 3, and 1 act like Home, PgUp, PgDn, and End. When Num Lock is on, digit keys produce the corresponding digit. On Apple Macintosh computers, which lack a Num Lock key, the numeric keypad always produces only numbers; the Num Lock key is replaced by the ''Clear key''. The arrangement of digits on numeric keypads with the 7-8-9 keys two rows above the 1-2-3 keys is derived from calculators and cash registers. It is notably different from the layout of telephone Touch-Tone keypads which have the 1-2-3 keys on top and 7-8-9 keys on the third row. This difference in layout can be confusing. Numeric keypads are useful for entering long sequences of numbers quickly, for example in spreadsheets, financial/accounting programs, and calculators. Input in this style is similar to a calculator or adding machine. == Measuring speed == Ten key speed is measured in Keystrokes per Hour (KPH). The minimum required speed for many data entry jobs is around 9000 KPH with good accuracy. A speed of 12,000 is considered excellent. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「numeric keypad」の詳細全文を読む スポンサード リンク
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