import sys


def printe(*args, end="\n", **kwargs):
    print(*args, end=end, file=sys.stderr, **kwargs)


def main():
    MOD = 998244353
    for _ in range(int(input())):
        N, M = map(int, input().split())
        if N <= M:
            print((pow(10, N, MOD) - 1) % MOD)
            continue
        divided_digits = N
        divisor_interval = M - 1

        # まずは確実に0で埋められるところを埋めきる
        divided_digits %= (divisor_interval + 1) * 2

        if divided_digits == 0:
            print(0)
            continue
        if divided_digits >= divisor_interval + 2:
            min_digit = divided_digits - divisor_interval
            max_digit = divided_digits - (min_digit - 1)

            print((pow(10, max_digit, MOD) - pow(10, min_digit - 1, MOD)) % MOD)
        else:
            print((pow(10, divided_digits, MOD) - 1) % MOD)
    # 11111111111
    # 1001
    # 01101111111
    # 00100111111
    # 00000011111
    # 00000001101
    # 00000000100


if __name__ == "__main__":
    main()