310 and 410: 360
3/10 and 4/10: 7/20
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(299+111)/2 = 410/2 = 205
310.
You can calculate the number halfway between 250 and 330 by adding them together, then divide by 2. For example, 250 + 330 = 580, and 580 divided by 2 = 290, which is the number halfway between the two numbers.
The number half way between two others is the mean average of those numbers: 1/2 x (1 410 + 1 460) = 1/2 x 2 870 = 1 435
3.75 is halfway between.