estimate a 15% tip on a $42.65 check

I first take 10% = $4.30

Then I double it = about $8.60

Then I pick a number about half way between = about $6.50

To estimate a 15% tip on a $42.65 check, you can follow these simple steps:

Step 1: Calculate the tip amount:
To find the tip amount, you need to multiply the check amount by the tip percentage. In this case, the tip percentage is 15%, which can be expressed as 0.15. So, the tip amount can be calculated as:
Tip Amount = Check Amount * Tip Percentage

Tip Amount = $42.65 * 0.15

Step 2: Calculate the total amount, including the tip:
To determine the total amount, you add the check amount and the tip amount. So, the total amount, including the tip, can be calculated as:
Total Amount = Check Amount + Tip Amount

Total Amount = $42.65 + (Tip Amount from Step 1)

By plugging in the values, the calculation becomes:
Total Amount = $42.65 + (0.15 * $42.65)

Step 3: Simplify the calculation:
To simplify the calculation, you can first find the value of 0.15 * $42.65 using a calculator. This will give you the exact tip amount, which can be added to the check amount to find the total.

Using a calculator, 0.15 * $42.65 equals $6.3975 (rounded to four decimal places). Therefore, the tip amount is approximately $6.40.

Now, you can add the tip amount to the check amount:
Total Amount = $42.65 + $6.40

The estimated total amount, including the 15% tip, is approximately $49.05.

So, an estimated 15% tip on a $42.65 check is $6.40, and the total amount, including the tip, is approximately $49.05.