100 + 0
99 + 1
98 + 2
97 + 3
.
.
.
52 + 48
51 + 49
This list has 50 members. If you don't like that zero in (100+0), then there are only 49 pairs.
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There are 8 different pairs of whole numbers whose prodcut is 40. Allowing for commutativity (a*b = b*a), there are 16 possible ways.
51
An infinite number.
There are many pairs of consecutive whole numbers that lie between the square roots of 46, which are approx -6.78 and +6.78. -4 and -3, for example.
Four of them.