The distributive property is not used for simplified multiplication. See http://www.algebrahelp.com/lessons/simplifying/distribution for information about how to use the distributive property to simplify other equations. 20 x 12 is already simplified, so the proper way to solve it is 12
x20
-----
240
You could potentially factor and use the commutative property to find a simpler equation, ex.
20x12 -- break 20 into 10 and 2
10x2x12 -- multiply 2 by 12
10x24 -- multiply by 10
240
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Multiplication can be the first step when using the distributive property with subtraction. The distributive law of multiplication over subtraction is that the difference of the subtraction problem and then multiply, or multiply each individual products and then find the difference.
7*9 = 9*(10 - 3) = 90 - 27 = 63
5*43 = 5*(40 + 3) = 5*40 + 5*3 = 200 + 15 = 215
you would go: (30x9) + (7x9) = 270 + 63 = 333 which is the same as if you typed 37x9 into the calculator and got 333!
The distributive property states that for any real numbers a, b, and c, a(b + c) = ab + ac. To create an equation that equals 18 using the distributive property, you can use the factors 2 and 9. For example, 2(7 + 4) = 2(7) + 2(4) = 14 + 8 = 18.