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Q: What is halfway between 21 and 63?

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42

19.5 is halfway between 18 and 21

There is no distance between them.

26.5

It is: 64.5

It is: (63+57)/2 = 60

It is: 75

(17 + 63)/2 = 80/2 = 40

There are lots of numbers between 63 and 720. Exactly halfway between them is 391.50, so that may be the answer you are looking for.

37

It is: (18+21)/2 = 19.5

Add 55 and 21, then divide by 2 = 38

21

Yes.

Do you mean like what is the number exactly between them. 53+63=116/2=58

107

84

(21+29)/2 = 50/2 = 25

(21 + 69)/2 = 90/2 = 45

There is no "the" rational" number since there is an infinity of them. Start with the number halfway between the two: (1/10+1/11)/2 = 21/220. Then try halfway between 1/10 and 21/220, and then halfway between 1/10 and that on. And so on.

Because 63 divided by 3 is 21. 63/3=21

63 - 21 = 42

34

√(7 x 63) = 2.645751311 x 7.937253933 = 21

The LCM of 21 and 63 is 63.