Ever saw a kid counting a lot of number with a great speed? I have see it myself. The kid is not using a calculator, he is using chinese abacus called suanpan. Abacus was used in China about 14th century ago. Now there is a school teaching math to student using abacus. The school already create a method so the student know how to count fast with abacus. Kid with abacus can count faster than adult using a calculator.
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