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Exact 20% Tip Calculation

0:33
1:50
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At 0:33 in

How to find 10 and 20% of any number

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What happens here

Once the 10% tip amount is calculated (e.g., $1.78), double this amount to find the 20% tip. The presenter breaks down the multiplication for clarity: first doubling the dollar amount (e.g., $1.50 x 2 = $3.00), then doubling the cents (e.g., $0.28 x 2 = $0.56), and finally adding them together ($3.00 + $0.56 = $3.56). This provides the exact 20% tip.

Goal: Calculate an accurate 20% tip based on the 10% tip.

Tools and materials

  • Dry Erase Marker — Writing the calculations
  • Whiteboard U.S. General — Displaying the calculations
  • 10% Tip Amount N/A — The base amount for 20% tip calculation

What they say

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point, all right? Let's do 20%. So, all you got to do is times it by two. That gives you 20%. So, let's break this down. So, you got a dollar 50 times two gives you $3, right? We can break this down. We can break it down to 28 times two which equals 56. Or, if you want to break it down even more, you could do 25 times two equals 50. You have three left over. Three times two equals six. Add them all together and you got $3 and 56 cents equals 20 percent of 1776, all right? Now, what if we want

Auto-generated from the video audio.