standard notation: 1,456
expanded notation: 1,000+400+50+6
written: one thousand four hundred fifty six
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to write it in numbers
5.5 × 10-1This is not a number you would normally write in standard form. As it is very short. Usually numbers are written in standard form to save time.
arabic numbers or decimal numbers
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: 84,000
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