12
9(10+3)
12 x 18 = (12 x 10) + (12 x 8)
An example of the distributive property is 5 x (10 + 2) = (5 x 10) + (5 x 2), or in more general form, A(B+C) = AB+AC
5x10 = 5(5x5) = (5x5) + (5x5) = 50.
10*46 = 10*(40+6) = 10*40 + 10*6 (using the distributive property) = 400 + 60 = 460 Except that to multiply by 10 you should not need the ditributive property!
10(2k + 5)
12
19*14 = 19*(10 + 4) = 19*10 + 19*4 = 190 + 76 = 266 (You could use the distributive property again to split 19 into 10 + 9 but that is multiplying by 19 is simple enough and using the distributive property for that is just laziness.
12*56 Use the distributive property on 12: (10+2)*56 = 10*56 + 2*56 Use the distributive property on 56 twice: 10*(50+6) + 2*(50+6) = 10*50 + 10*6 + 2*50 + 2*6 = 500 + 60 + 100 + 12 = 672
9(10+3)
10+9x70
Whether or not the distributive property can or should be used depends on what you wish to multiply 43.2 by. For example, if you wish to multiply 43.2 by 10, the distributive property is irrelevant!
4 x 18 = (4 x 10) + (4 x 8)
12 times 14 = 12*(10 + 4) You could apply the distributive property twice and go for (10 + 2)*(10 + 4)
12 x 18 = (12 x 10) + (12 x 8)
The distributive property of multiplication over addition is that you can multiply the addends of a number times a number and add those together. 25 time 10=5*10+20*10