One method to find your lucky number using numerology is to add the day, month and year of your birth together. If the result is a two-digit number, the next step is to add those two digits together to arrive at the number.
Technically, the number arrived at using this method is known as the birth path number. It indicates the path one will take in life. If a person was born April 3, 1989, the formula for arriving at the birth path number would be 4+3+1+9+8+9. This comes out to 35, and when broken down further, the number becomes eight. Each number has its own numerological meaning. A person with a birth path number of eight, for example, is described as practical, successful and focused on business.
Another lucky or significant number in numerology is the birthday number. This number is quite simple to calculate, as it only consists on the day of the month you were born. One catch is that if the day you were born has two digits, then both the full and reduced versions are considered important. In other words, if you were born on the 11th day of the month, both two and 11 are significant.