TODAY MATH TRICK
Multiplication of two numbers that differ by 6 (This
trick only works if you have memorized or can quickly
calculate the squares of numbers.
If the two numbers differ by 6 then their product is the square of their average minus 9.
EXP. 10*16 = 13^2 - 9 = 160
22*28 = 25^2 - 9 = 616
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