What fluency means
Fluency is being able to give a basic fact quickly and correctly without working it out each time, so that attention is free for the harder problem the fact belongs to. It has two parts, accuracy and speed, and a timed test measures both at once. A student who is accurate but slow needs more practice, not a lower grade, and a student who is fast but wrong needs to slow down and check.
Choosing the length
A one-minute test is quick enough to repeat daily and is the easiest to use as a warm-up. A three-minute test gives a steadier score, because a single slow start matters less. A five-minute test suits a mixed set of facts or a whole table and works as an end-of-unit check. Whatever the length, give the same one repeatedly so that a change in the score means something.
Using the scores
The most useful comparison is between a student and their own earlier score. The progress record is a blank chart for that: each student colors a bar to their score after each test and writes the date underneath. Look through the missed facts on the key for the same few facts, and give those more practice with a one-table test or with the flash drill.
The drill on the board
The drill shows one fact in very large type with a question mark for the answer. The timer bar counts down and then shows the answer, or you can show it yourself with Space. Because the class sees the answer together, the drill is a good place for students to say it aloud, to explain a strategy for a hard fact, or to notice patterns in a table.