(800.565-565) :1000

To subtract 800.565 from 1000, you simply subtract each digit in the corresponding place value:

• Subtract the decimals: 5 - 0 = 5
• Subtract the ones: 6 - 5 = 1
• Subtract the tens: 5 - 6 = -1 (borrow 1 from the hundreds place)
• Subtract the hundreds: 5 - 0 - 1 = 4
• Subtract the thousands: 1 - 0 = 1

Therefore, 1000 - 800.565 = 199.435