4 ms·
In my head I would do: 30 * 24 (which is just 3 * 24 * 10) = 720 6 * 24 (which is the same as 12 * 12) = 144 720 + 144 = 864
by YooLi 16y ago
In my head I would do:
30 * 24 (which is just 3 * 24 * 10) = 720
6 * 24 (which is the same as 12 * 12) = 144
720 + 144 = 864