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Divisibility rules: 2, 3, 4, 5, 9, 10
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4-point ladder

Divisibility rules: 2, 3, 4, 5, 9, 10, 4-point ladder

●●○4 points, difficulty 2 of 34 pt

Two steps, or one step plus a trap.

3 in a row to finish this ladder.

0/3 solved

KA-0011

about 60s

The four-digit number 27_4 is divisible by 3. Which digit could go in the gap?