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Q: What number is halfway between 13 and 21?

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34

19.5 is halfway between 18 and 21

21

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

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.

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

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

There is no distance between them.

To find the number halfway between any two numbers x and y, add x and y, then divide the answer by 2. So for 21 and 35, 21+ 35 = 56. 56/2 = 28. You can check your answer by seeing that 21 + 7 = 28 and 35 - 7 = 28.

42

It is 20, the number halfway between the two middle values.

42

37

(21+53)/2 = 37

Add 55 and 21, then divide by 2 = 38

Yes.

37The answer is 37It is: 37

The answer is 1414

Since the numbers are coprime, the answer is 21*13 = 273.

It is 45 69 +21 = 90 90/2 = 45

Add the absolute value of the two numbers -9 and 33 to get 42. 1/2 of 42 (midway) is 21

You can add any one of 13, 15, 17, 19 and 21.

to get the answer, you multiply them both together and divide by 2. 61 divided by 2 is 30.5 30.5 is the answer.

The answer is 1 13/21

1 8/13