You have to know the basic multiplication to be able to do this kind of math. Well, 13 times 5 equals 65. 5 times 3 equals 15, carry your 1. 5 times 1 equals 5 plus the 1 you carried which is 6. Now bring the two numbers 6 and 5 and you will have 65.
These factor pairs, when multiplied together, equal 65:
(1, 65)
(5, 13)
As a product of its prime factors: 5 times 13 = 65
84
65 times 1 equals 65
It goes in 65 times.
It is: (9 and 2/7) times 7 = 65
65 times 4a is equal to 260a.
4 times 65 = 260
It is: 5636/1625 times 65 = 225.44
501 times 65=32565
It is: 32.5 times 2 = 65
It is: 2 times 32.5 = 65
9 x 65/9 = 65
It is: (65+65)*4 = 520
65*60 = 3900