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Mathematics

Round off each of the following numbers to their nearest tens:

(i) 77

(ii) 903

(iii) 1205

(iv) 999

Number System

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Answer

(i) 77

The digit at ones place is 7. Since 7 is greater than 5, we increase the tens digit by 1 and replace the ones digit by 0.

Hence, the rounded off number to the nearest tens = 80.

(ii) 903

The digit at ones place is 3. Since 3 is less than 5, we replace the ones digit by 0 and keep all other digits as they are.

Hence, the rounded off number to the nearest tens = 900.

(iii) 1205

The digit at ones place is 5. So, we increase the tens digit by 1 and replace the ones digit by 0.

Hence, the rounded off number to the nearest tens = 1,210.

(iv) 999

The digit at ones place is 9. Since 9 is greater than 5, we increase the tens digit by 1 and replace the ones digit by 0. As the tens digit is 9, increasing it by 1 carries over to the hundreds digit.

Hence, the rounded off number to the nearest tens = 1,000.

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