IKMC 2027 - Grades 3-4 - Self-study SET 4 - Thematic Batch 3 Question 11

The following three expressions have the stated values:
9 × 9 + 7 = 88; 98 × 9 + 6 = 888; 987 × 9 + 5 = 8888.
What is the value of 9876543 × 9 + 1?