12.5 comes halfway because if u imagine 15 was 14 just find what is halfway to that but remember it is 15 the actually the number then put the point five so it is 12.5
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It is: 15
-12.5
It is (5 + 10)/2 = 15/2 = 7.5
5 It is 15 more than -10 and 15 less than +20. To find the halfway point (the average), add the two numbers and divide by 2. -10 + 20 = 10 divided by 2 = 5
2/3 = 10/15 4/5 = 12/15 halfways between 10/15 and 12/15 is 11/15