Find the common difference. From 6600 to 5600 is 1000 over 2 steps.
• Common difference = 1000 ÷ 2 = 500, decreasing
• The pattern decreases by 500 each step.
• First blank: 6600 − 500 = 6100
• Second blank: 5600 − 500 = 5100
• Check: 5100 − 500 = 4600 ✓ ; 4600 − 500 = 4100 ✓
Final Answer: 6100, 5100