Nina used 100 beads to make 2bracelets 50 of the beads were red . she wrote down that 0.05 of the beads were red. did nina write the decimal correctly? explain

Yes, she did, because the place of the digit (5) is in the hundredth place, indicating that she used 100 beads. 

No, Nina did not write the decimal correctly.
--
50 is half of 100, or 50% of 100.
To convert a percentage into a decimal, put a decimal point two spaces to the left of the percentage sign.
In this case, it would be 0.50.
--
Good luck, and I hope this helped.

Letter a (: : : : : : : : : :