CHINA: THE GREAT WALL Construction of the Great Wall was begun in 221 B.C. for the purpose of keeping out barbarians from the north.  It stretches 4,000 miles in an east-west direction.  It is built of many different materials, from granite rock to tampered earth.  Ranging from 15-50 feet high with a base width between 15 and 30 feet, the wall has guard towers spread across the entire length of the wall.  Estimates are that over a million workers were used to build the Great Wall.  Many died from disease and injury and were thrown into the foundations of the next section of the wall. In order to build the Great Wall, engineers had to make accurate measurements.  Their measurements are based on the li.  This table of conversions will help you solve the problems below. 1 cutty = 1.1 pounds 1 pound = .9 cutties 1 li = .3 miles 1 mile = 3.2 li 1 Chinese foot = 1.1 feet 1 foot = .9 Chinese foot 1 mou = .164 acres 1 acre = 6.1 mou Use the information above to answer these questions. 1. As of the year 2001, how many years has it been since construction of the Great Wall began? ________________________ 2. How many li long is the Great Wall?__________________________________ 3. In Chinese feet, what is the range of the height of the Great Wall? ________________________ 4. If a stone used to build the great Wall weights 110 cutty, how many pounds does it weigh? ___________________ 5. If a stone is 3 Chinese feet long, how many feet is that? _______________ 6. How many stones would it take to stretch the length of 3 miles (1 mile = 5,280 feet) if each stone was 3 Chinese feet long? _______________ 7. How many acres would be in half a mou? _____________________ 8. How many mou would be on a twenty acre farm? ______________________ The Great Wall Solutions Back to Melting Pot Math