How To: Subtract numbers on an abacus calculator

Subtract numbers on an abacus calculator

Lawrence Perez, from Saddleback College, and his assistant Charlie, give this two-part arithmetic lesson on subtracting with an abacus. Could this be any easier than adding? Maybe, can you "borrow" the knowledge to subtract these numbers without an electric calculator? See for yourself.

(1) Part 1 of 2 - How to Subtract numbers on an abacus calculator, (2) Part 2 of 2 - How to Subtract numbers on an abacus calculator

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