642 + 798 round the answer to the nearest thousand = 1440
1000
1000
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800
0.798 rounds to1.0 to the nearest unit0.8 to the nearest tenth0.80 to the nearest hundredth
5
798 to the nearest tens place = 800
800
800
800
6 174 798 604 is your answer.
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400
-798 is the ratio of -798 and 1. That's rational.