Nothing going on here, move along…

To change binery to numbers is pretty simple.

10101²

You write out your usual grid

16| 8| 4| 2| 1|

  1| 0| 1| 0| 1|

Then x each top number by the bottom number starting with the 1

1×1=1

2×0=0

4×1=4

8×0=0

16×1=16

Then add the answers together

1+0+4+0+16=21 to the power of 10

Or you can just add up the numbers that have a 1 below them, just not in exams!

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