(7 x 10) + (7 x 4) + (7 x 0.6) = 70 + 28 + 4.2 = 102.2
21.6
distributive
6 x 4.3 = 6 x 4 + 6 x 0.3 = 24 + 1.8 = 25.8
(7 x 60) + (7 x 5) = 420 + 35 = 455
One way is: 15 * 104 = 15*(100 + 4) = 15*100 + 15*4 = 1500 + 60 = 1560
To find the sum as a product of the greatest common factor of two numbers basically indicates that you need to use the distributive property. For example, 44+40=4(10+11). It's just how many times the GCF goes into the factors. In this case 4 goes into 40, 10 times and 4 goes into 44, 11 times.
distributive
distributive.
OWO
6 x 4.3 = 6 x 4 + 6 x 0.3 = 24 + 1.8 = 25.8
7*9 = 9*(10 - 3) = 90 - 27 = 63
(7 x 60) + (7 x 5) = 420 + 35 = 455
You don't need to use the distributive property. 3*17 = 51 so 30*17 = 510 Why invoke procedures that are not necessary?
5*43 = 5*(40 + 3) = 5*40 + 5*3 = 200 + 15 = 215
7*46 = 7*(40 + 6) = 7*40 + 7*6 = 280 + 42 = 322
Some people use the distributive property to add 24 and 36, but you wouldn't use it to find the GCF which, by the way, is 12.
I don't. I learned the 18 times table at school - around 50 years ago - and still recall it.
None whatsoever. You might find the distributive property useful when trying to calculate 39*74. Of course, if you are familiar with the 39 times table or the 74 times table, the distributive property is a complete waste of time! But somehow I doubt that level of arithmetic competence.