4.5 billion in standard form is 4,500,000,000
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h-45 but not sure about "standard form".
Well, honey, to write forty five hundredths in standard form, you simply write it as 0.45. That's it, no frills or fancy footwork needed. Just slap that decimal point in there and call it a day.
45.0
45, like any integer, can be written as a fraction in simplest form by putting it over 1. 45% = 9/20
2/5