7. Estimate a 15% tip on a $42.65 check.

Convert the 15% top into a decimal. You move the decimal two places to the left so you would get. 15

Now multiple the. 15 by $42.65.

You should get around 6.3975.

When you round you should get $6.40.

So the tip on the $42.65 check is about $6.40.