if you draw out the 10x10 multiplication table, anything 0 * x or x * 0 ends in 0 (19 out of 100 cases), and any even number times 5 also ends in 0 (8 out of 10

if you draw out the 10x10 multiplication table, anything 0 * x or x * 0 ends in 0 (19 out of 100 cases), and any even number times 5 also ends in 0 (8 out of 100 cases), which lines up with the 27% you're seeing. Since this is on the units digit, Benford's law doesn't apply and you can basically expect the distribution of units digits to be uniform.