3 + 97
11 + 89
17 + 83
29 + 71
41 + 59
47 + 53
I think these are all of them.
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100 = 2 x 2 x 5 x 5
25 of them.
eight (8)
25 primes.
7.5 can be written an infinite number of ways; e.g. 75/10; 750/100; 7500/1000 along with many other ways.