• Double-double the number you are multiplying four by.  (Double it twice)
  • 4 x 3  (Double 3 twice)
    • 3 doubled is 6, 6 doubled is 12 
  • 4 x 6 (Double 6 twice)
    • 6 doubled is 12, 12 doubled is 24)
• Another way to figure the answer is double the answer you would get if you multiplied the number by 2.
  • 4 x 3 (Double the 2 x 3 answer) 
    • The answer to 3 x 2 = 6
    • Double the 6 to get 12
  • 4 x 6 (Double the 2 x 6 answer)
    • The answer to 2 x 6 = 12
    • Double the 12 to get 24

Use the chart below to quiz yourself. 
Look at the fact below and think of the answer.  Check it by hovering the mouse over the problem.

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