9 = 8 + 2
Since we have covered 1- 8 , 10 , 11 we will mention them only in passing
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Mathematics - Rules of Addition & Multiplication
Arithmetic Operations Addition Addition involves combining groups of 1 into a bigger group. Examples : 4 + 5 is 1111 + 11111 = 111111111 ( ...
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Note: Any number greater than ten but less than twenty is expressed as a pair of digits : a one (1) together with another digit - 1digit. ...
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This pictorial abacus is a hybrid machine. It makes use of the general operations of the Abacus but without the physical constraints like n... -
I will take a rest from tables for a while and demonstrate how Heuristic can be used to solve all multiplication problems without resorting...
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