5
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454
189 rounded up to the nearest 100 number would be 200; 200 subtracted from 643 = 443 , 200 - 189 454
450
When a number is 0, 1, 2, 3 or 4 it rounds down. When a number is 5, 6, 7, 8 or 9 it rounds up. In the case of 454 the tens digit is a 5 so you round up. The answer is 500 grams.
454 + 454 + 454 + 454 + 454 + 454 = 2724