456
18 9,2 3,3,2
13 is already prime. Just write it down.
5 x 13 = 65 To show work, divide 65 by 5.
Divide by 3 or 5. 3 x 5 = 15
48 24,2 12,2,2 6,2,2,2 3,2,2,2,2
Use a factor tree. 1023 341,3 31,11,3
520 = 2 × 2 × 2 × 5 × 13
Use a factor tree. 78 39,2 13,3,2
Multiply the factors. They should equal the original number.
Use a factor tree. 36 18,2 9,2,2 3,3,2,2
It is: 2*2*5*7 = 140 by dividing it by each prime number that has no remainder
There is no work. The only prime number ending in 5 is 5.