1kg 620g is equivalent to 1.62kg. To the nearest half kilogram, this would be rounded to 1.5kg. This rounding is done by looking at the digit immediately after the decimal point, which is 2 in this case. Since 2 is less than 5, we round down to 1.5kg.
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1kg and 620g is equivalent to 2kg to the nearest half kilogram. When rounding to the nearest half kilogram, any weight with 0.5kg or more is rounded up to the next whole kilogram. Since 620g is more than halfway to the next kilogram (500g), the weight of 1kg and 620g is rounded up to 2kg.
3/8 rounded to the nearest half is 0.5
38.412 rounded to the nearest half is 38.5
12.5
8