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Replace each number to the nearest hundred of the following and calculate the answer again in the nearest hundred. 

(i) 247 + 691 

(ii) 4316 + 1567 

(iii) 7122 – 3565 

(iv) 4543 – 2036

1 Answer

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(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

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