2torial #0592: Learn2 Calculate Tips (continued) Calculate 15% If you need some help with percentage tip calculating, here's an easy way to figure out 15% of a number. Let's say the bill was $44.38. First, locate the decimal point, that little dot after the second four of 44 (no, it's not a fly-dropping). Take 10% of this number by moving the decimal point one place over to the left, so that it's between the fours of 44. You now have $4.40 (skip the 38 cents) as 10% of the bill. Halve that number to figure out 5% of the bill; that will give you $2.20. Add the figures of 10% and 5% to get 15% of the bill. In this case, it's $4.40 plus $2.20, equaling $6.60. If the service was adequate but slow or impersonal, then leave $5 or $6. If the service was decent but not fantastic, leave $7. If the service was superior, tip $8 or $9   -end- Learn More! or All steps at once (printable version)