Arithmetic of Computers

Lesson 8

Octal Arithmetic

The sum gets a bonus

Page 281

Previous Lesson

Your answer :

You are correct. What we have so far is .256₈ = .33…₁₀ Now let’s get the next digit.

.256₈ × 12₈ .534₈ 2.56₈ 1st complete product → 3.314₈ × 12₈ .630₈ 3.14₈ 2nd complete product → 3.770₈ × 12₈ 1.760₈ 7.70₈ 3rd complete product → 11.660₈

Now look what’s happened! The integral part of our 3rd complete product, which is supposed to be the 3rd digit of our decimal fraction, is a two-digit number. What do we use for the next digit of our decimal number?

Answer :

.256₈ = .331…₁₀

Go to Page 263

.256₈ = .3311…₁₀

Go to Page 272

.256₈ = .339…₁₀

Go to Page 274

Answer to Self-Test Question 5, Lesson 8 :

a. .304 rounded to .30; b. .417 rounded to .42; c. .673 rounded to .67