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Multiplying large numbers in your head

Learning the nine times table

The butterfly method for adding and subtracting fractions

Multiplying by 11 (example: 11×32)

Memorizing Pi

Multiplying by 6, 7, 8, and 9 using only your hands

Finding the percentage of a number

Finding a fraction of a whole number

Converting Celcius to Farenheit and vice versa