Question

1.In 1863, President Abraham Lincoln gave his famous Gettysburg Address. It starts, “Four score and seven years ago....” Four score and seven is equal to 87. How many years are in a score? What year was President Lincoln referring to?

Answer 1

Four scorn and 7 years =87
4x+7=87

Answer 2

There are 20 years in a score, so "four score and seven years ago" refers to 87 years before (as 4 x 20 + 7 = 87), that is, 1776 (87 years before 1863, the year of the Gettysburg Address, as 1863 - 87 = 1776). Therefore, President Lincoln was referring to the year of the Declaration of the Independence of the United States of America.