Simplified Rounded 10% Tip Calculation

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How to find 10 and 20% of any number

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What happens here

For a quicker, more simplified approach, take the total bill (e.g., $17.76) and first round it to the nearest whole dollar. In this example, $17.76 rounds up to $18.00. Then, similar to the exact method, move the decimal point one place to the left. This results in $1.80, which is your estimated 10% tip. This method sacrifices a little precision for speed and ease of mental calculation.

Goal: Quickly estimate a 10% tip by rounding the total bill first.

Tools and materials

Dry Erase Marker — Writing the calculations
Whiteboard U.S. General — Displaying the calculations
Bill Amount N/A — The base amount for simplified tip calculation

What they say

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percent of 1776, all right? Now, what if we want to keep this easier because little change doesn't matter, help somebody out, it is what it is. So, you can take the 1776, round this whole bad boy up to 18. Move your decimal in and you got a dollar 80 which is 10% okay? Times that by two. All my skateboard guys up there, snowboard, ski guys, whatever. You guys

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