SOLUTION: convert 10101two to base ten

Question 640832: convert 10101two to base ten
Found 2 solutions by jim_thompson5910, Alan3354:
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
1(2^4)+0(2^3)+1(2^2)+0(2^1)+1(2^0)

1(16)+0(8)+1(4)+0(2)+1(1)

16+0+4+0+1

21

So 10101 base 2 = 21 base 10
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
convert 10101two to base ten
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To do these conversions "in your head",
Work from left to right:
The 1st bit is a 1
If the 2nd bit is 0, then double it = 2
The 3rd bit is 1, so double the 2, then add 1 = 5
4th is 0 --> 10
5th is 1, 10*2 + 1 --> 21
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