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the following is ABACUS NUMBER GRID video: LEARN ADDITION, SUBTRACTION, MULTIPLICATION AND DIVISION MORE EASILY.
NUMBER GRID ABACUS OR COMMONLY REFERRED TO AS PRESSURISM, IS A CALCULATION TOOL TO MAKE IT EASIER TO LEARN ADDITION, SUBTRACTION, MULTIPLICATION AND DIVISION FASTER.
With this tool we can do calculations from the smallest value of the unit to billions.