Explain why a highly precise measurement does not always mean a highly accurate one.

Precision is defined as: The ability of a measurement to be consistently reproduced.

Example: I can throw a dart at the dartboard and hit a triple 20 every time even though I'm trying to hit the bullseye. This would mean that I'm very precise with my throws but still not very accurate since I'm trying to hit the bullseye.

It is very simple. Precision generally refers to the "exactness" of a number. For example, a time of 1.2 seconds is LESS precise than 1.24 seconds simply because 1.24 goes farther past the decimal. The more decimals after the decimal, the more precise the number is. Or, the smaller the unit of measurement, the more precise it is. Another example: 1 centimeter is more precise than 1 meter because 1 cm. is a smaller unit.

Accuracy just says how right you are or close to the correct answer you are. Finally, an example to explain both:

If asked what time it is, you say, "It is 2:15 and 48 seconds". This is a detailed number and very precise. However, if it was really 6:30, your answer of 2:15 is not accurate.