It is 112.5 because half of 25 is 12.5. Just add another hundred :)
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Well, darling, the number between 100 and 150 is 125. It's right smack dab in the middle, like the cherry on top of a sundae. So there you have it, plain and simple.
137.5
Add the two and divide by two. Let's try it: 5+7=12 12÷2=6 --halfway between 5 and 7 is 6. Again: 125+239=364 364÷2=182 -- halfway between 125 and 239 is 182. You can also do this long form: 239-125=114 & 114÷2=57 then 125+57=182 -- back to halfway.
The number half-way between 125 and 150 is (125 + 250) / 2 = 187.5.
125