Is 5.35
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18 and 54
54 is halfway between them.
It is 20, the number halfway between the two middle values.
54, 56, 58, 60, 62, 64, 66, 68, 70, 72
55. To find a number halfway between two numbers on the number line, add the two numbers together and divide by 2, so (82 + 28)/2 = 110/2 = 55. Check the answer: 55-28 = 27, and 82-55 = 27.Example: what is half way between 4 and 6 (the obvious answer is 5), but work it through: (4+6)/2 = 10/2 = 5.