Change the representation of 1025 from base five to base ten.

A good answer might be:

1025   =   1 × 5102 + 0 × 5101 + 2 × 5100   =   2510 + 210   =   2710

Base Seven

Here is another example: 3267. This means: 

3×seven2 + 2×seven1 + 6×seven0

To write the number in decimal, write the powers of seven in decimal and perform the arithmetic: 

3 ×  7102 + 2 × 7101 + 6 × 7100

3 × 4910  + 2 × 710 + 6 × 1 

14710 + 1410 + 610    =    16710.

QUESTION 10:

Can 6827 be rewritten in base ten notation?