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What is 157?
15-7 = 8
What is the number between 13 and 17?
The whole number between 13 and 17 is 15
What is in the middle of 0.15 and 0.8?
.8-.15=.65 so this is the distance between them. Half that distance is .325. Now .325 to .15 or subtract it from .8 and we have the number in the middle. .475 is the number exactly in the middle. This might be easier to see with some integers. Take 6 and 8 and we want to know what number is in the middle. Of course we know it is 7. But 8-6 is 2 so that is the distance between them. Now add 1/2 of that, which is 1 to 6 or subtract it from 8 and you have 7. So .325 is the distance between the two numbers, .475 is the number that would be equidistant from both on the number line.
Find two numbers whose sum is 38 and whose difference is 8?
Subtract 8 from 38; divide by 2 for the first number; add 8 for the second number. Example: 38 - 8 = 30 / 2 = 15 (first number). 15 + 8 = 23 (second number). Proof: 15 + 23 = 38.
What number is halfway between -5 and 15?
Well, honey, if you wanna find the number smack dab in the middle of -5 and 15, you just average those two bad boys. So, (-5 + 15) / 2 = 5. There you have it, sweet cheeks, 5 is the magic number that's halfway between those two extremes.
