Part 1

1. Take the number of stairs in the Persepolitan Stairway: 111
2. Subtract from it, the number of letters in the name of the ancient Aztec Empire’s capital: 12
3. Divide that answer by the number of stones in a traditional Maya hearth: 3
4. From the result, subtract the number of times Julius Caesar was stabbed according to most popular accounts: 23
5. Place the result in the first set of blanks below

Part 2

1. Take the year in which armies from the Maya site of Tikal conquered Uaxactun: 378
2. Subtract from it, the year in which Rome had six emperors: 238
3. Divide that number by the number of trilithons at Stonehenge: 5
4. From the result, subtract the number of steps at Djoser’s pyramid in Saqqara: 6
5. Place the result in the second set of blanks below

Part 3

1. Subtract the year of Alexander the Great’s death from the year of his birth: 356-323
2. Multiply that number by the number of Aubrey holes: 56
3. Add to this result the inner diameter in feet of the Pantheon’s dome (this number is the same as the height of the oculus from the floor): 142
4. Add to this result the number of World Heritage Sites in the United States: 21
5. Place the result in the third set of blanks below