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# Probably a simple answer to this...

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Why bother with a post grad course - waste of time? 17-10-2016
1. Could somebody here please inform me how 2/(2^(8) is the same as 1/(2^(7)?

I can't seem to figure out any logical answer explaining how halving the numerator changers the exponent on the denominator by -1?

I'm sure i'm being an idiot here but I can't figure it out.
2. (Original post by Squire1998)
Could somebody here please inform me how 2/(2^(8) is the same as 1/(2^(7)?

I can't seem to figure out any logical answer explaining how halving the numerator changers the exponent on the denominator by -1?

I'm sure i'm being an idiot here but I can't figure it out.
= ....?

The opposite is if that helps. (or think about what it means when b is negative)
3. 2/2^8 = 2/2x2x2x2x2x2x2x2

The 2 in the numerator cancels one of the 2's in the denominator hence:

1/2^7 = 1/2x2x2x2x2x2x2
4. (Original post by tjena)
2/2^8 = 2/2x2x2x2x2x2x2x2

The 2 in the numerator cancels one of the 2's in the denominator hence:

1/2^7 = 1/2x2x2x2x2x2x2
Ah, so I was being an idiot. Thanks! that's cleared it up.
5. (Original post by Squire1998)
Ah, so I was being an idiot. Thanks! that's cleared it up.
No worries. Good luck

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