/*
Bismillah Medal
Nama: Muhammad Tatas Maulana
Sekolah: MAN Insan Cendekia Lombok Timur
Member of Zevthasses Elmaerifa
*/
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int, int> pii;
typedef vector<int> vi;
typedef vector<ll> vll;
#define pb push_back
#define all(x) (x).begin(), (x).end()
#define fi first
#define se second
#define endl '\n'
const ll MOD = 1e9 + 7;
const ll INF = 1e18;
void solve()
{
ll l, r;
cin >> l >> r;
ll batas_atas;
ll batas_bawah;
if (r % 9 == 0)
{
batas_atas = r;
}
else
{
batas_atas = ((r / 9) + 1) * 9;
}
if (l % 9 == 1)
{
batas_bawah = l;
}
else
{
batas_bawah = ((r / 9)) * 9;
}
ll jumlah = (batas_atas - batas_bawah + 1) / 9;
ll total = jumlah * (45);
ll temp = 9;
for (ll i = batas_atas; i > r; i--)
{
total -= temp;
temp--;
}
temp = 1;
for (ll i = batas_bawah; i < l; i++)
{
total -= temp;
temp++;
}
cout << total << endl;
}
int main()
{
ios::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
int t = 1;
cin >> t; // Uncomment if multiple test cases
while (t--)
{
solve();
}
return 0;
}
