Haz tratado con union simple?
Código PHP:
$sql = "SELECT * FROM numero_0 WHERE ID_NUM = '".$num."'
UNION
SELECT * FROM numero_1 WHERE ID_NUM = '".$num."'
UNION
SELECT * FROM numero_2 WHERE ID_NUM = '".$num."'
UNION
SELECT * FROM numero_3 WHERE ID_NUM = '".$num."'
UNION
SELECT * FROM numero_4 WHERE ID_NUM = '".$num."'
UNION
SELECT * FROM numero_5 WHERE ID_NUM = '".$num."'
UNION
SELECT * FROM numero_6 WHERE ID_NUM = '".$num."'
UNION
SELECT * FROM numero_7 WHERE ID_NUM = '".$num."'
UNION
SELECT * FROM numero_8 WHERE ID_NUM = '".$num."'
UNION
SELECT * FROM numero_9 WHERE ID_NUM = '".$num."'";