28 million in number form is written as 28,000,000. This is because each comma represents a grouping of three digits, starting from the right. The first comma after the 28 indicates thousands, the second indicates millions, and so on.
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Writing a number in standard form simply means to express the number in its 'normal' form. Therefore, your example is written in standard form.
19/28 is in its simplest form.
28
28 = twenty-eight.
0.042 and 0.028