Cupro-nickel.
PS Any idea how this came up on the algebra board?
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yes.
No. The last year for silver dimes and quarters was 1964.
1964 and before, dimes were made out of 90 percent silver. The same went for quarters and half dollars. And then the us mint made half dollars from 1965-1969 40 percent silver.
U.S. dimes, quarters, and halves dated 1964 contain 90% silver and 10% copper. Gross weights: Dime, 2.5 gm. Quarter, 6.25 gm. Half, 12.5 gm
U.S. dimes, quarters, and half dollars were made of 90% silver up till 1964. Today those denominations are made of copper-nickel, and dollar coins are made of manganese brass. Note that nickels are also made of copper-nickel. The only nickels that ever had any silver in them were minted from 1942 to 1945.