Arithmetic of Computers

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Lesson 8

Octal Arithmetic

The sum gets a bonus

Page 273

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Your answer :

Did you forget to find the second partial product? That is, did you multiply by the 2 and forget to multiply by the 1 in front of it? The part we had done was:

.256₈ × 12₈ 1st partial products → .534₈ → 2.56₈ 1st complete product → 3.314₈

Now we continue by multiplying the fractional part only of the first complete product by 12₈:

1st complete product → 3.314₈ × 12₈ 2nd partial products → .630₈ → 3.14₈

Sum the second partial products and you will have the second complete product. The integral part of the second complete product is the second digit in the decimal equivalent of .256₈.

Return to Page 262 and choose another answer.

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Answer to Self-Test Question 4, Lesson 8 :

From the complete products.