Mathematics
Round off each of the following numbers to their nearest tens:
(i) 77
(ii) 903
(iii) 1205
(iv) 999
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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To stitch a trouser, 1 m 30 cm cloth is needed. Out of 25 m cloth, how many trousers can be stitched and how much cloth will remain?
Estimate each of the following numbers to their nearest hundreds:
(i) 1246
(ii) 32057
(iii) 53961
(iv) 555555
Estimate each of the following numbers to their nearest thousands:
(i) 5706
(ii) 378
(iii) 47,599
(iv) 1,09,736