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→Method 3: Octal to Binary / Binary to Octal
# '''One octal number''' represents '''3 binary numbers''', so space-out<br>the octal numbers to make space for a binary number.
# Write '''(4)(2)(1)''' under <u>each</u> octal number.
# Write '''0''''s or '''1''''s for each group of binary numbers to add up to the <br>corresponding octal number (refer to diagram of ''octal to binary'' conversion).<br><br>
==== Method 4: Hexadecimal to Binary / Binary to Hexadecimal ====
