#### Answer

1kg of nickels is 200 nickels.

#### Work Step by Step

Use ratio and cross multiplication to find the number of nickels. Remember that the ratios must use the same unit of measure. 1kg is 1000g.
$\frac{1\ nickel}{5\ g}=\frac{x\ nickels}{1000g}$
$5x=(1)(1000)$
$5x\div5=1000\div5$
$x=200$