Measurements $($inexact numbers$)$: Quantities of properties of a substance that are determined with the use of an instrument.

Counted numbers $($exact numbers$)$: Not measurements because they were determined by counting and not by using an instrument.

Accuracy: Indicates how close a measurement $($or an average of a set of measurements$)$ is to the "true" value.

Precision: An indicator of reproducibility of data collected $($that is$,$ how close a set of measurements on the same object are to each other$).$

Significant figure: All certain digits and one $($only one$)$ uncertain $($estimated$)$ digit in measurements.

Leading zeros: All zeros before the first non$-$zero digit

Confined zeros: All zeros between non$-$zero digits

Trailing zeros: All zeros after the last non$-$zero digit

$\backslash$table$[[$Significant$,$Not Significant$],[$All non$-$zero digits,All leading zeros$],[,],[$All confined zeros,$\backslash$table$[[$All trailing zeros if no decimal$],[$point or overbar is present$]]],[\backslash$table$[[$All trailing zeros if a decimal$],[$point or overbar is present$]],]]$

$7$