numbers system

Question 1

what is the split digit numbers

Answer 1

If n ≤ 9 → it’s a 1-digit number.

If 9 < n ≤ 189 → it’s in two-digit numbers.

If 189 < n ≤ 2889 → it’s in three-digit numbers.

If 2889 < n ≤ 38889 → it’s in four-digit numbers.

Question 2

Hcf easy formula 78,39,135

Answer 2

195-39=156

195-78=117
78-39=39.

Hcf of answers then ans 13