\begin{tabular}{|}\( \left.\begin{array}{c}\text { The dinner check for Lee's family was } \$ 79.30 \text {. Estimate a } 15 \% \text { tip. } \\ \begin{array}{l}\text { about } \$ 12 \\ \text { about } \$ 15 \\ \text { about } \$ 8 \\ \text { about } \$ 10\end{array}\end{array}\right] \)\end{tabular}

To estimate a 15% tip on the dinner check of $79.30, you can round the total to $80 for smoother calculations. Calculating 15% of $80 is easy: simply take 10% (which is $8) and add half of that (which is $4). So, $8 + $4 equals $12. This makes our estimated tip about $12, fitting nicely within a reasonable range for good service! When estimating tips, many people often forget to consider rounding. A common mistake is just taking 15% directly of the actual amount without simplifying the total—which can lead to unnecessary overthinking. For larger bills, rounding to the nearest ten or five can simplify your mental math process and give you a more accurate quick estimation!