Posted by **Devan** on Monday, September 27, 2010 at 10:25pm.

Base Twelve.

B08twelve + ? = 9twelve

- college math -
**bobpursley**, Monday, September 27, 2010 at 10:28pm
So is your question using base twelve, 08+?=9

or is it

Base eight, 12 + ?= what in base 12?

I have no idea what your question is

- college math -
**Reiny**, Monday, September 27, 2010 at 10:40pm
Are you supposed to work your arithmetic within the base 12 ?

If so, then you should have an addition table, which you can use also for subtraction

Other option:

switch the numbers to base 10, do the arithmetic, then switch back.

B08twelve + ? = 9twelve

(11(12^2) + 0(12) + 8) + ? = 9

1592 + ? = 9

the missing number is -1583

which in base 12 = -AB1

to work within the base

B08

- 9 I will have to borrow, all the way from the B

-----

AB1

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