It is 7144.
Most schools wrongly teach you to always round a half up (so the answer would be 7148) but, while this is a simple rule to teach, it is not really correct. Under this rule:
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It is 4 rounded to the nearest ones or units
4.05 rounded to the nearest whole number is 4
It is 7 when rounded to the nearest ones because .4 is less than .5
It would be 3.7. Rounded to the nearest whole number is 4.
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