Question

Estimate a 15% tip for $69

Answer 1

http://www.onlineconversion.com/percentcalc.htm

Answer 2

Thank you so much @KamiBug

Answer 3

you can round $69 to $70

then multiply 15 by 70 to get

70*15 = 1050

so 15% of 70 is 10.50 (I moved the decimal over 2 spots)