M1 · Explorer
Arithmetic
Divisibility rules
Rule
By 2: even last digit. By 3: digit sum divisible by 3. By 5: last digit 0 or 5. By 9: digit sum divisible by 9. By 10: last digit 0.
Example
126 is divisible by 3 because 1+2+6 = 9.
Tip
Use digit sums to test 3 and 9 quickly.
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