We (humans) normally count in tens. So we have big numbers represented, in decimal form by the number of thousands, hundreds, tens, units, tenths, hundredths and so on. The place for each digit is ten times that to the right. The octal (or base 8) system does the same but with powers of 8.
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67 base eight + 12 base eight
16. The base has eight around it and there are eight more connecting the vertices of the base to the apex of the pyramid.
It is eight.
octal
Eight.