SOLUTION: Emily knows that 4x10 = 40. How can she use subtraction and multiples of 9 to find 4 x 9?

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Question 953200: Emily knows that 4x10 = 40. How can she use subtraction and multiples of 9 to find 4 x 9?
Answer by Alan3354(69443) About Me  (Show Source):
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Emily knows that 4x10 = 40. How can she use subtraction and multiples of 9 to find 4 x 9?
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4*9 is one fewer 4 than 4*10
Subract 4