Divisibility rules provide ways to quickly determine if a number is divisible by another number without performing long division. The document outlines divisibility rules for several numbers: - A number is divisible by 2 if the last digit is even. It is divisible by 5 if the last digit is 0 or 5. It is divisible by 10 if the last digit is 0. - For divisibility by 3, add the digits and check if the sum is divisible by 3. For 6, check if it meets the rules for both 2 and 3. For 9, check the digit sum. - To check divisibility by 4, see if the last two digits are divisible by 4 without a remainder. For 8,