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4- If the last two digits are divisible by 4, the whole number is divisible by 4. 6- If the number is even and also divisible by 3, it is divisible by 6.
Any multiple of two must end in 0, 2, 4, 6 or 8.
2 : The number ends with a 2, 4, 6, 8, or zero. (The number is 'even'.)3 : The sum of the digits in the number is divisible by 3 .5 : The number ends with a zero or a 5 .6 : The number passes the tests above for both 2 and 3 .10 : The number ends with a zero.
The way to know if a number is divisible by 3 is if its digit sum adds up to a number that is divisible by 3 (3, 6 or 9). The way to know if a number is divisible by 2 is if that number is even. That is, a number is divisible by two if the units are 0, 2, 4, 6 or 8. A number is divisible by 6 if it meets both these rules. In this case, 402 has the digit sum 6, and the units value is 2. Therefore, we can say that 402 is divisible by 6.
A number is divisible by 3 if the sum of its digits is a multiple of 3. A number is divisible by 6 if the sum of its digits is a multiple of 3 and it's even. A number is divisible by 9 if the sum of its digits is a multiple of 9.