#define _USE_MATH_DEFINES
#include <iostream>
#include <string>
#include <algorithm>
#include <vector>
#include <queue>
#include <math.h>
#include <cmath>
#include <stack>
#include <map>
#include <set>
#include <numeric>
#include <iomanip>
#include <climits>
#include <functional>
#include <cassert>
#include <tuple>
using namespace std;
using ll = long long;

int T;
ll mod = 998244353;

//ループの回数は適宜修正
ll power(ll a, ll b, ll m) {
    ll p = a, ans = 1;
    for(int i = 0; i < 60; i++) {
        ll wari = (1LL << i);
        if((b / wari) % 2 == 1) {
            ans = (ans * p) % m;
        }
        p = (p * p) % m;
    }
    return ans;
}

ll division(ll a, ll b, ll m) {
    return ((a % m) * power(b, m-2, m)) % m;
}

int main() {

    cin >> T;
    while(T--) {
        ll N, M;
        cin >> N >> M;
        if(N <= M) {
            ll ans = power(10,N,mod);
            ans = (ans-1+mod)%mod;
            cout << ans << endl;
        } else {
            ll r = N%(2*M);
            ll ans;
            if(r < M) {
                ans = power(10,r,mod);
                ans = (ans-1+mod)%mod;
            } else {
                ll a = power(10,M,mod);
                a = (a-1+mod)%mod;
                ll b = power(10,r-M,mod);
                b = (b-1+mod)%mod;
                ans = (a-b+mod)%mod;
            }
            cout << ans << endl;
        }
    }

}