It depends on whether the operation is addition, subtraction, multiplication, division, exponentiation or some other binary operation.
One of the simplest answers is 20+20 and 10+30
There are infinitely many pairs. The simplest to find is 1 and 40.
There 4 pairs of primes that can give a sum 40 in addition. They are (3,37), (11,29), (17,23),(19,21).
20 of them
4, if you multiply them.
Between 35 and 40, 36 has the most factor pairs.
An infinite number.
Make pairs, of one number from each end:1 + 40 = 412 + 39 = 413 + 38 = 414 + 37 = 415 + 36 = 41..19 + 22 = 4120 + 21 = 41You made pairs out of 40 numbers, so you have 20 pairs.Each pair adds up to 41.The sum is (20) x (41) = 820 .
The two numbers can be 5 times 8 = 40
An infinite number. The factor pairs are (40,1)(20,2)(10,4)(8,5)
Explaining how to find all factors pairs of 40 is easy. All you have to do is find which whole numbers 40 can be divided into.
The product of all pairs of prime numbers is always the least common multiple of the two prime numbers.
37 and 3 29 and 11 23 and 17