SAT math: is it divisible by 3, 6, or 9? find out instantly

2754. divisible by 3, 6, or 9?

add the digits until you get one number.
2+7+5+4 = 18 → 1+8 = 9

9 is divisible by 3 → yes
single digit is 9 → also divisible by 9 → yes
even number AND divisible by 3 → divisible by 6 → yes

one digit sum. three answers.

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