999 + 9/9 = 1000
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1000 = 999 + (999 / 999)Due to the rules of BODMAS, the brackets aren't technically necessary.
Every ten there is a nine in the ones place, therefore there are 100 nines in the ones place.Every hundred there are 10 nines in the tens place, therefore add 10 * 10 nines. eg 90, 91, 92, 93, ... in the tens placeEvery thousand there are 100 nines in the hundreds place, therefore add 100 nines.Total is 300.
99/9=11
200
There are 1000 micrograms in a milligram. Therefore, you multiply by 1000 here. 5 milligrams is 5x1000 or 5,000 micrograms.