Arithmetic of Computers

from Tenscope Limited

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Lesson 8

Octal Arithmetic

The sum gets a bonus

Page 261

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Your answer :

1 3 2₈ 2 0 7₈ 6 4 2₈ + 2 1 7₈ + 7 0 2₈ + 2 4 6₈ 3 5 1₈ 1, 1 1 1₈ 1, 1 1 0₈ ⎫⎪⎬⎪⎭This set contains a mistake.

Here they are, showing the carries explicitly:

carries → 1 1 1 1 1 1 1 3 2₈ 2 0 7₈ 6 4 2₈ 2 1 7₈ 7 0 2₈ 2 4 6₈ 3 5 1₈ 1, 1 1 1₈ 1, 1 1 0₈

They’re all correct. Return to page 270 and look again.