#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#include <atcoder/all>
using namespace atcoder;
ll mod = 998244353;
int main () {
	int T ;
	cin >> T;
	while (T--) {
		ll N, M;
		cin >> N >> M;
		ll a = N / M, b = N % M;
		ll ans = pow_mod(10, b, mod);
		if (a & 1) {
			ans = (pow_mod(10, M, mod) + 1 - ans + mod) % mod;
		}
		ans = (ans + mod - 1) % mod;
		cout << ans << endl;
	}
}