Arithmetic of Computers

Self-Test Questions : Lesson 8

Octal Arithmetic

The sum gets a bonus

1.

Add:

a. 4₈ + 6₈

b. 5₈ + 7₈

c. 6₈ + 5₈

d. 3₈ + 5₈

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2.

Here’s some practice in octal addition:

a. 423₈ + 645₈

b. 264₈ + 375₈

c. 527₈ + 673₈

d. 673₈ + 547₈

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3.

Multiply by 12₈:

a. 547₈

b. 364₈

c. 256₈

d. 317₈

e. 427₈

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4.

In converting an octal fraction to decimal, if you use the method of repeated multiplication by 12₈, are the digits of the answer taken from the partial products, or the complete products?

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5.

Convert these octal fractions to 2-place decimals, using multiplication:

a. .234₈

b. .326₈

c. .531₈

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6.

In converting octal fractions to decimals by multiplication, what do you do when an integral part of a complete product is 11₈?