Mental abacus
The abacus system is a way to calculate math in your head, by imagining an abacus.[1] People can calculate math very fast this way. For example, using this method, Takeo Sasano was able to add fifteen three-digit numbers in just 1.7 seconds.[2]
This system is being used in China,[3] Singapore, South Korea, Thailand, Malaysia, and Japan.
The abacus can be used to do addition, subtraction, multiplication, and division. It can also be used to get square and cube[4] roots.
Related pages
changeReferences
change- ↑ "Research on the benefits of mental abacus for development". Retrieved March 12, 2012.
- ↑ Alex Bellos (2012), "World's fastest number game wows spectators and scientists", The Guardian
- ↑ "(Chinese)Teaching Kids Visit to use abacus for mental calculation". Archived from the original on February 13, 2017. Retrieved March 12, 2012.
- ↑ Feynman, Richard (1985). "Lucky Numbers". Surely you're joking, Mr. Feynman!. New York: W.W. Norton. ISBN 0-393-31604-1. OCLC 10925248.
Other websites
change- Mental abacus does away with words, New Scientist, August 9, 2011
- Ku Y, Hong B, Zhou W, Bodner M, Zhou YD (2012). "Sequential neural processes in abacus mental addition: an EEG and FMRI case study". PLOS ONE. 7 (5): e36410. Bibcode:2012PLoSO...736410K. doi:10.1371/journal.pone.0036410. PMC 3344852. PMID 22574155.