#include <stdio.h>

int Mod;

long long pow_mod(int n, long long k)
{
	long long N, ans = 1;
	for (N = n; k > 0; k >>= 1, N = N * N % Mod) if (k & 1) ans = ans * N % Mod;
	return ans;
}

int solve(long long A, int B, int C)
{
	if (C == 0) return A / B % 10;
	else if (B % 10 == 0) return solve(A, B / 10, C - 1);
	else if (B % 5 == 0) return solve(A * 2, B / 5, C - 1);
	else if (B % 2 == 0) return solve(A * 5, B / 2, C - 1);
	
	Mod = B;
	return (A % B * pow_mod(10, C - 1) % B * 10) / B % 10;
}

int main()
{
	int t, T, A, B, C;
	scanf("%d", &T);
	for (t = 1; t <= T; t++) {
		scanf("%d %d %d", &A, &B, &C);
		printf("%d\n", solve(A, B, C));
	}
	fflush(stdout);
	return 0;
}