Subject: multiplying decimals Name: Danielle Who are you: Student When she eats at a restaurant,Viviana like to leave a 15% tip,multiplying the price of the meal by 0.15. Franklin usually leaves a 20% tip,multiplying the price by 0.20.They both round up to the nearest \$0.05. How much tip would Viviana leave for a \$24.85 meal? Hi Danielle, A tip of 15% is easy to calculate. You can do it in your head, especially if you round to the nearest \$0.10 at each step. What I do is think of 15% as 10% plus 5%. For example if the bill is \$30.29 then what I do is 10% of \$30.29 is one-tenth of \$30.29 so just move the decimal one place left to get \$3.029 I think of this as \$3.00 5% is half of 10% and half of \$3.00 is \$1.50 Hence I would leave a tip of \$3.00 + \$1.50 = \$4.50. Viviana's calculation is a little different. She keeps better track and then rounds up to the nearest \$0.05, so her calculation are 10% of \$30.29 is \$3.029 5% of \$30.29 is half of \$3.029 or \$1.5145 Thus 15% of \$30.29 is \$3.029 + \$1.5145 = \$4.5435 Rounding up to the nearest nickel gives a tip of \$4.55 Penny