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→Method 3: Octal to Binary / Binary to Octal
''Binary to Octal''
# '''One octal number ''' represents '''3 binary numbers''', so '''starting from right-side''', group binary digits into '''groups of 3''' <br>(add leading zeros if necessary).# Write '''(4)(2)(1) ''' under <u>each</u> '''group of 3 binary numbers'''.
# Multiply the placeholders (i.e. '''0''''s and '''1''''s) by the corresponding '''(4)(2)(1)''' for each group to obtain the octal number (refer to diagram of ''binary to octal'' conversion).<br><br>
''Octal to Binary''
# '''One octal number ''' represents '''3 binary numbers''', so space-out 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 corresponding octal number (refer to diagram of ''octal to binary'' conversion).<br><br>
==== Method 4: Hexadecimal to Binary / Binary to Hexadecimal ====
