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Finding the total cost including tax or markup

Uses the technique of adding the percentages fiirst before multiplying so that the answer is immediate.

From  Tom Grant 10 plays 0  

Converting a fraction to a percentage: Denominator of 20, 25, or 50

Fraction conversions that are simpler than they look.

From  Tom Grant 9 plays 0  

Greatest common factor of 2 numbers

From  Tom Grant 23 plays 0