Lesson 8
Octal Arithmetic
The sum gets a bonus
Page 264
Look at the two diagrams below, which show the addition of 5 to 6 in the octal and decimal systems:
OCTAL
six
plus
five more
⁄ 18 28 38 48 58 68 \
⁄ 78 108 118 128 138 \
148 158
DECIMAL
six
plus
five more
⁄ 110 210 310 410 510 610 \
⁄ 710 810 910 1010 1110 \
1210 1310
When you count five numbers beyond 6 in the octal system, you reach 138 , not 118 , don’t you? Since 138 = 1110 , the quantity you reach is the same in both systems, but it is written 138 in octal and 1110 in decimal.
Now return to Page 259 and choose the right answer.
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