540
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there are 3 tens
537 round to 530 78 round to 80 53*2 = 106 106*2 = 212 121*2 = 424 and the two 0s - one each from 530 and 80 - make it 42400. [The exact answer is 41886]
65340.
540
To round a number to the nearest hundred, go to the tens column. If it is a 5 or over, round up to the next hundred. If it is a 4 or lower, round down.So in 5465, the tens column has a 6. Therefore you round up to 5500.If you wanted to round 5443 to the nearest hundred, you would round down to 5400 because there is a 4 in the tens column.