IKMC 2027 - Grades 3-4 - Self-study SET 22 - Thematic Batch 3 Question 21

What is the value of the expression below?
(11 + 22 + 33 + ... + 99) ÷ (1 + 2 + 3 + ... + 9) − (1 + 2 + 3 + ... + 9) ÷ [(15 × 15) ÷ (3 × 3) + 2 × 2 × 5]