#include <bits/stdc++.h>
#define int ll
using namespace std;
#define rep(i,n) for(int i=0;i<n;i++)
#define per(i,n) for(int i=n-1;i>=0;i--)
#define rng(i,c,n) for(int i=c;i<n;i++)
#define fi first
#define se second
#define pb push_back
#define all(a) a.begin(), a.end()
#define sz(a) ((int) a.size())
#define vec(...) vector<__VA_ARGS__>
#define _4ab8goq ios::sync_with_stdio(0),cin.tie(0);
typedef long long ll;
typedef vector<int> vi;
typedef pair<int,int> pii;
void print(){cout<<'\n';}
template<class h,class...t>
void print(const h&v,const t&...u){cout<<v<<' ',print(u...);}

const int mod=998244353;

int binpow(int a,int b,int mod){
	int ret=1;
	while(b){
		if(b%2){
			ret=ret*a%mod;
			ret%=mod;
		}
		a=a*a%mod;
		a%=mod;
		b/=2;
	}
	return ret;
}

void slv(){
	int n,m;
	cin>>n>>m;

	if(n<=m){
		print((binpow(10,n,mod)+mod-1)%mod);
	}else{
		n%=(2*m);
		if(n<=m){
			int ans=binpow(10,n,mod)-1;
			ans+=mod;
			ans%=mod;
			print(ans);
		}else{
			int ans=binpow(10,m,mod);
			ans-=(binpow(10,n-m,mod));
			ans+=mod;
			ans%=mod;
			print(ans);
		}
	}
}

signed main(){
_4ab8goq;
	int __t;
	cin>>__t;
	rep(cs,__t){
		slv();
	}
}