Twenty one hundred in standard form is written as 2100. In standard form, numbers are expressed in the form of a single digit followed by any necessary zeros.
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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 as: 2,100
Eight hundred one thousand eight hundred twenty-two in standard form
Six hundred twenty-one thousandths in standard form = 6.21 × 10-1
120,018
The standard form is 71,821,010
Word form = one million, three hundred ninety-eight thousand, five hundred twenty-one. Standard form = 1,398,521