TOP TIP!!!: If you have a multiplication that contains an even number of negatives, IGNORE THE MINUS SIGNS!
-9 x -15 is exactly the same as 9 x 15 ie 135.
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1/9 * (n - 15)the product of one-ninth and the difference of a number and fifteen:Let n = the number1/9 * (n - 15)
1, 3, 5, 9, 15, 45 -1, -3, -5, -9, -15, -45
The two numbers must be 6 and 9, as 6 + 9 = 15 and theer is a difference of 3 between 6 and 9. The product of 6 and 9 = 54.
60 is 15 more than 45.
six and nine