2 operands at a time, from left to right or right to left won't make any difference as long as all the operators are multipication.
3*13 is the prime factorization of 39. If you use non-integers, there are infinite many pairs (or groups) of numbers that multiplied makes 39.
3
30x3 is equal to 90.
Divide mutiply and add
Integers that are divisible by 3, integers that leave a remainder of 1 when divided by 3 and integers that leave a remainder of 2 when divided by 3.
-1, -3 and -8
2
1, 2 and 3 are the same whether you multiply or add them.
Mutiply it by a hundred as for example 3/4 times 100 = 75%
you multiply 3 digit numbers by killing yourself and giving away body parts.
11 * 0.3 = 11 * 3 / 10 = 33 / 10 = 3.3
you mutiply it by 5 and ten divide by the number 3 in your case.