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What is zero? Zero and place value

By |2017-07-29T17:35:52+00:00July 29th, 2017|Math|

A math problem showing place value How can you add big numbers without an abacus? You still group the sheep (or whatever) just as you did when you were using the abacus, but now you write the numbers down using place values, so that your hundreds are all underneath your other hundreds, your tens are underneath [...]