Let's say the bill is $12.34.
Calculating an Exact Tip
- Calculate 10% of the bill. Ten percent of a number is simply that number with the decimal place shifted left one spot. So ten percent of 12.34 is just 1.234 (round to 1.23).
10% tip:
- Tip is $1.23
15% tip:
- Start with the 10% of $12.34: 1.23.
- Now cut that number in half to make 0.615 (rounded to 0.62). This is 5% of the bill.
- Add 1.23 and 0.62 together to make 15%:
- Tip is $1.85
20% tip:
- Double the ten percent: 1.23 * 2
- Tip is $2.46
Easier Approximate Tip
That said, I typically approximate using only the dollar value, because it's easier.
- Round up to $13. Calculate 10% of 13. Ten percent of a number is simply that number with the decimal place shifted left one spot. 10% of 13 is 1.30
10% tip:
- Tip is $1.30
15% tip:
- Cut 1.30 in half to make 0.65. This makes 5% of the bill.
- Add 1.30 and 0.65 together to make 15%: (1.30 + 0.65)
- Tip is $1.95
20% tip:
- Double the ten percent: 1.30 * 2
- Tip is $2.60
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