Neither.
4.3 rounds, to the nearest unit, to 4.
It rounds, to the nearest 10 (or higher), to 0.
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430. Work: When looking to round, simply look at the number before the space you are looking to round and if it is 5 or more, round up, if it is lower than 5 then round down
430.
10 x 43 = 430
43 is a prime so 43 = 431
78000 20 430