#include <iostream>
#include <cstdint>
/* Test cases
- 1 1 5
+ 15
- 2 9 13 44 45
+ 19 17
- 1 1998 2018
+ 102
- 1 1 1152921504606846976
+ 5764607523034234920
*/
uint64_t calc(uint64_t x) {
if(x == 0)
return 0;
if(x == 1)
return 1;
uint64_t y = (x-1)/9;
y *= 45;
x = x%9;
if(x == 0)
x = 9;
y += x*(x+1)/2;
return y;
}
int main() {
int Q;
std::cin >> Q;
while(Q--) {
uint64_t l, r;
std::cin >> l >> r;
std::cout << calc(r) - calc(l-1) << '\n';
}
return 0;
}
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