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Trachtenberg system
Multiplication table
iOS. Android [1] Release. 2005. Genre (s) Mathematics. Mode (s) Single player. FASTT Math (acronym for Fluency and Automaticity through Systematic Teaching Technology) is a mathematic educational software developed and released by Scholastic Corporation in 2005. [2][3]
This technique allows easy multiplication of numbers close and below 100.(90-99) [2] The variables will be the two numbers one multiplies. The product of two variables ranging from 90-99 will result in a 4-digit number. The first step is to find the ones-digit and the tens digit. Subtract both variables from 100 which will result in 2 one-digit ...
Multiplication algorithm
Mental abacus. The abacus system of mental calculation is a system where users mentally visualize an abacus to carry out arithmetical calculations. [ 1] No physical abacus is used; only the answers are written down. Calculations can be made at great speed in this way.
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