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seventeen
13 + 4 = 17 = 21 - 4
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Earn +20 ptsQ: What number is halfway between 13 and 21?
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What number is halfway between 21 and 35?
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.
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