If you do it in binary you only need addition.
12 × 34 = 0xC x 0x22 = 1100 x 100010
Only two 1's!
1100 add 5 zeroes + 1100 add one zero = 110011000 = 408
ta-daa!
Addition and conditional bit shifting (which is multiplication by powers of 2).
Addition and conditional bit shifting (which is multiplication by powers of 2).