A score is 20. So 40 score would be 800...
but I'm guessing you are asking about the Gettysburg Address "four-score and seven years ago..." which means "87 years ago..."
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56
Twenty trillion seven hundred and seven billion seven hundred and twenty seven million seven hundred and seventy seven thousand = 20,707,727,777,000
7,000,707 = seven million, seven hundred and seven
seven and seven ten-thousandths
0.777 is "zero point seven seven seven". Or "seven hundred seventy-seven thousandths".