You would need metal cutters.
US nickels weigh 5.00 gm so one-fifth of a single coin would weigh 1 gm.
Current Canadian nickels weigh 3.95 gm so approximately one-quarter of a nickel would weigh 1 gm.
A U.S. nickel weighs 5 grams. 20 Nickels equal 100 grams.
520 grams of nickels is 104 nickels. (each US nickel weighs 5 grams).
More information is needed. Please post a new, separate question stating how many nickels you save each week.
2400 nickels or $120.00
16 nickels
One nickel weighs 5 grams, so 1.4 nickels weigh 7 grams.
U.S. Nickels weigh 5 grams. So 2 well equal 10 grams.
24
100 grams, each nickel weighs 5 grams.
20
$1.25
200