mod = 998244353
for _ in [0]*int(input()):
    n, m = map(int, input().split())
    n %= m * 2
    if n <= m:
        print((pow(10, n, mod) - 1) % mod)
    else:
        print((pow(10, m*2-n, mod) - 1) * pow(10, n-m, mod) % mod)