#1**+2 **

Just note that in base 8, anything above 8 gets carried to the next place value. Eg., 4 + 5 = 11, as 4 + 5 is 9, and 8 out of that 9 is carried to the 10s place to become a 1.

Therefore,

4 base(8) + 7 base(8) = **13 base(8)**

This is because 7 + 4 = 11, and taking away 8 we get 3. The 3 stays in the unit's place, and the 8 that we took away becomes the 1 in the tens place.

(13 base(8) is just **11** in base(10))

ArithmeticBrains1234 Mar 26, 2021