import sys
#input = sys.stdin.readline #文字列につけてはダメ
input = sys.stdin.buffer.readline #文字列につけてはダメ
#sys.setrecursionlimit(1000000)
#import bisect
#import itertools
#import random
#from heapq import heapify, heappop, heappush
#from collections import defaultdict 
#from collections import deque
#import copy
import math
#from functools import lru_cache
#@lru_cache(maxsize=None)
#MOD = pow(10,9) + 7
#MOD = 998244353
#dx = [1,0,-1,0]
#dy = [0,1,0,-1]


def main():
    t = int(input())
    for _ in range(t):
        a,b,c = map(int,input().split())
        g = math.gcd(a,b)
        a //= g; b //= g
        ans = a * pow(10,c,b*10) //b
        print(ans%10)     
        

if __name__ == '__main__':
    main()