1. If executing multiply instructions, a 3 X multiplicand is generated. 2. Suppose for simplicity that the multiplicand has three digits. 3. Find the product of the multiplier and the tens-digits of the multiplicand . 4. The ones-digit of the multiplicand is 9 and the multiplier is 3. 5. Let the first factor be called the multiplicand . 6. The hundreds-digit of the multiplicand is 7, while the multiplier is 3. 7. The ones-digits of the multiplicand and multiplier form a column : the ones-column. 8. After writing the multiplicands on the sides, consider each cell, beginning with the top left cell. 9. As a rule of thumb, Karatsuba is usually faster when the multiplicands are longer than 320 640 bits. 10. The SSEM had included two registers, implemented as Williams tubes : the multiplicand and multiplier for a multiplication operation.
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