Question

Complete the following pattern.
9 − 1 =
98 − 21 =
987 − 321 =
9876 − 4321 =
98765 − 54321 =
What comes next?
$\left[3\right]$

Answer 1

9 − 1 = 8
98 − 21 = 77
$\left[1\right]$
987 − 321 = 666
9876 − 4321 = 555
$\left[1\right]$
98765 − 54321 = 4444
next, from observation:

987654 − 654321 = 33333
$\left[1\right]$