25.5 is the median of these two numbers (the number that exists halfway between these two numbers).
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Half way between 36 and 42 is (36 + 42) ÷ 2 = 39.
60
The halfway point between two numbers is found by taking the average of the two numbers. In this case, the average of -24 and 36 is (-24 + 36) / 2 = 12 / 2 = 6. Therefore, the number halfway between -24 and 36 is 6.
18 and 54
Halfway between 15 and 30 is the average of the two numbers. To find the average, you add the two numbers together and then divide by 2. In this case, (15 + 30) / 2 = 45 / 2 = 22.5. Therefore, 22.5 is halfway between 15 and 30.