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Since score is defined as 20, 4 score is 80. I am assuming by 4 score you mean 4 score years (as opposed to 4 score seconds, minutes, etc.). Since 4 score is 80, 4 score years is 80 years.
Since there are 100 years in a century, you just multiply 100 x 4, which is 400 years in 4 centuries.
4
leap years come every 4 years and last a year
Count the years that are multiples of 4: 1948, 1952, 1956...