Find the common difference between consecutive terms.

• 4420 − 4520 = −100
• The pattern decreases by 100 each step.
• First blank: 4420 − 100 = 4320
• Second blank: 4320 − 100 = 4220
• Check: 4220 − 100 = 4120 ✓ ; 4120 − 100 = 4020 ✓

Final Answer: 4320, 4220