Q.1
Is 378 divisible by 6? By 9? Give the correct rules.
378 is divisible by 6 and by 9 because 3+7+8 = 18, which is divisible by 9 and by 6.
378 is divisible by 3 and by 9 because 3+7+8 = 18, which is divisible by 9 and 3. Since it ends in an even number, it is divisible by 2. Since it is divisible by 2 and by 3, it is divisible by 6.
378 is divisible not by 6 or by 9 because 3+7+8 = 18, which is not 9 or 6.