Question: 5 pence is how many dollars?
Answer: I'm assuming that when you say "five pence" you mean 0.05 of a GBP. I'm also neglecting any kind of exchange fee you'd have to pay for such an exchange (likely to be far greater than 0.05 GBP). This value is constantly changing. But as of yesterday's market close (March 22, 2016), it is worth exactly 0.0707785 USD.