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Question

Find the sum of 456 and 717 after rounding off them to the nearest tens.

A
1160
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B
1280
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C
1180
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D
1190
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Solution

The correct option is C 1180
To round off a number to the nearest tens, if the units digit is greater than or equal to 5, then tens digit will be increased by 1 and units digit will be replaced by 0.

In 456, units digit is 6 which is greater than 5.
So, 456 is rounded off to 460.

In 717, units digit is 7 which is greater than 5.
So, 717 is rounded off to 720.

460 + 720 = 1180

Hence, sum of 456 and 717 after rounding off them to the nearest tens is 1180.

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