#include <bits/stdc++.h>
using namespace std;
#define fio() ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL)
#define mid ((start+end)/2)
#define pb push_back
const long long li = 500005;
long long t;
int main()
{
fio();
int arr[10] = {0,1,3,6,10,15,21,28,36,45};
cin >> t;
long long l,r;
long long a,b;
while(t--){
cin >> l >> r;
if(r%9 == 0){
a = r-9;
} else{
a = r;
}
if(l%9 == 0){
b = l-9;
} else{
b = l;
}
long long range = (a/9) - (b/9);
cout << (range*45) + arr[(r-1)%9 +1] - arr[(l-1)%9] << endl;
}
return 0;
}
