The answer is 20.
20
1x20 2x10 4x5
2x10, 5x4
2X10 would work, as would 5X4.
The Commutative Property (of Multiplication) says that 4x5 = 5x4. So, If 4x5 = 20, then 5x4 will also be 20.
Associative property
5X4=20 then you divide it by 4. :) Good luck!
8x4+5x4 +9= 61
having the property that one term operating on a second is equal to the second operating on the first, as an example: 4x5=5x4 or 5x4=4x5 RATE MY ANSWER THE BESTEST OF ALL!!!!
No It is not 5x4=20 and 5x100=500
it is equal to equal lol:P