(i) 247 + 691
Tens place digit in 247 = 4 < 5
Rounding off 247 to nearest hundred = 200
Tens place digit in number 691 = 9 > 5
Digit of hundred =6 + 1 = 7
Rounding off 691 to nearest = 700
Thus, 200 + 700 = 900
(ii) 4316 + 1567
Tens place digit in 4316 = 1 < 5
Rounding off 4316 to nearest hundred = 4300
Tens place digit in 1567 = 6 > 5
Digit of hundred = 5 + 1 = 6
Rounding off 1567 to nearest hundred = 1600
Thus, 4300 + 1600 = 5900
(iii) 7122 – 3565
Tens digit in 7122 = 2 < 5
Rounding off 7122 to nearest hundred = 7100
Tens place digit in 3565 = 6 > 5
Digit of hundred =5 + 1 = 6
Rounding off 3565 to nearest hundred = 3600
Thus, 7100 – 3600 = 3500
(iv) 4543 – 2036
Tens place digit in 4543 = 4 < 5
Rounding off 4543 to nearest hundred = 4500
Rounding off 2036 to nearest hundred = 3 < 5
Rounding off 2036 to nearest hundred = 2000
Thus, 4500 – 2000 = 2500