Well, honey, you write 90 in short word form by simply saying "ninety." It's as easy as pie. No need to complicate things, just keep it short and sweet.
94,862,602
12.599 is the answer.
five and ninety hundredths
Three billion four hundred ninety-eight million two hundred fifty-two thousand nine hundred in standard form is 3,798,252,900
Ninety five hundred (9,500*) in standard form is 9.5 × 103* standard notation
Ninety eight and six tenths written in standard form is 98.6
95.00095
399,000,090
Eleven hundred ninety-five (1,195) in standard form = 1.195 × 103
93,000,000
The standard form is expressed as 78,090,000,000
Four thousand ninety-two ten-thousandths in standard form is 0.4092
3,099
2.095
190,000,000
90,500