400
400 is 100 more than 300 and 100 less than 500.
To find the halfway point (the average), add the two numbers and divide by 2.
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The number halfway between 25300 and 26500 is (25300 + 26500) ÷ 2 = 25900.
300 Find the difference (500-100=400) then halve the sum(200). Add the halved sum to the lowest number in the equaion(100) or subtract the halved sum(200)from the largest number in the equation(500) one:500-100=400 two:400/2=200 Three: 200+100=300 or 500-200=300
450 is half way between 300 and 600.
(500 + 800) / 2 = 650 Therefore, the number that falls in between 500 and 800 is 650.
The number is 250.5 because it is exactly 249.5 from either 1 or 500.